“An architect should live as little in cities as a painter. Send him to our hills, and let him study there what nature understands by a buttress, and what by a dome.”*…
We’ve misunderstood an important part of the history of urbanism– jungle cities. Patrick Roberts suggests that they have much to teach us…
Visions of “lost cities” in the jungle have consumed western imaginations since Europeans first visited the tropics of Asia, Africa and the Americas. From the Lost City of Z to El Dorado, a thirst for finding ancient civilisations and their treasures in perilous tropical forest settings has driven innumerable ill-fated expeditions. This obsession has seeped into western societies’ popular ideas of tropical forest cities, with overgrown ruins acting as the backdrop for fear, discovery and life-threatening challenges in countless films, novels and video games.
Throughout these depictions runs the idea that all ancient cities and states in tropical forests were doomed to fail. That the most resilient occupants of tropical forests are small villages of poison dart-blowing hunter-gatherers. And that vicious vines and towering trees – or, in the case of The Jungle Book, a boisterous army of monkeys – will inevitably claw any significant human achievement back into the suffocating green whence it came. This idea has been boosted by books and films that focus on the collapse of particularly enigmatic societies such as the Classic Maya. The decaying stone walls, the empty grand structures and the deserted streets of these tropical urban leftovers act as a tragic warning that our own way of life is not as secure as we would like to assume.
For a long time, western scholars took a similar view of the potential of tropical forests to sustain ancient cities. On the one hand, intensive agriculture, seen as necessary to fuel the growth of cities and powerful social elites, has been considered impossible on the wet, acidic, nutrient-poor soils of tropical forests. On the other, where the rubble of cities cannot be denied, in the drier tropics of North and Central America, south Asia and south-east Asia, ecological catastrophe has been seen as inevitable. Deforestation to make way for massive buildings and growing populations, an expansion of agriculture across marginal soils, as well as natural disasters such as mudslides, flooding and drought, must have made tropical cities a big challenge at best, and a fool’s gambit at worst.
Overhauling these stereotypes has been difficult. For one thing, the kind of large, multiyear field explorations usually undertaken on the sites of ancient cities are especially hard in tropical forests. Dense vegetation, mosquito-borne disease, poisonous plants and animals and torrential rain have made it arduous to find and excavate past urban centres. Where organic materials, rather than stone, might have been used as a construction material, the task becomes even more taxing. As a result, research into past tropical urbanism has lagged behind similar research in Mesopotamia and Egypt and the sweeping river valleys of east Asia.
Yet many tropical forest societies found immensely successful methods of food production, in even the most challenging of circumstances, which could sustain impressively large populations and social structures. The past two decades of archaeological exploration, applying the latest science from the land and the air, have stripped away canopies to provide new, more favourable assessments.
Not only did societies such as the Classic Maya and the Khmer empire of Cambodia flourish, but pre-colonial tropical cities were actually some of the most extensive urban landscapes anywhere in the pre-industrial world – far outstripping ancient Rome, Constantinople/Istanbul and the ancient cities of China.
Ancient tropical cities could be remarkably resilient, sometimes surviving many centuries longer than colonial- and industrial-period urban networks in similar environments. Although they could face immense obstacles, and often had to reinvent themselves to beat changing climates and their own exploitation of the surrounding landscape, they also developed completely new forms of what a city could be, and perhaps should be.
Extensive, interspersed with nature and combining food production with social and political function, these ancient cities are now catching the eyes of 21st-century urban planners trying to come to grips with tropical forests as sites of some of the fastest-growing human populations around the world today…
They may be vine-smothered ruins today, but the lost cities of the ancient tropics still have a lot to teach us about how to live alongside nature. Dr. Roberts (@palaeotropics) explains: “The real urban jungle: how ancient societies reimagined what cities could be,” adapted from his new book, Jungle: How Tropical Forests Shaped the World – and Us.
* John Ruskin
###
As we acclimate, we might send thoughtful birthday greetings to Sir Karl Raimund Popper; he was born on this date in 1902. One of the greatest philosophers of science of the 20th century, Popper is best known for his rejection of the classical inductivist views on the scientific method, in favor of empirical falsification: a theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can and should be scrutinized by decisive experiments. (Or more simply put, whereas classical inductive approaches considered hypotheses false until proven true, Popper reversed the logic: conclusions drawn from an empirical finding are true until proven false.)
Popper was also a powerful critic of historicism in political thought, and (in books like The Open Society and Its Enemies and The Poverty of Historicism) an enemy of authoritarianism and totalitarianism (in which role he was a mentor to George Soros).
“I found myself within a forest dark, for the straightfoward pathway had been lost”*…
What an early 14th century masterpiece can teach us today…
Dante Alighieri was early in recognising that our age has a problem. He was the first writer to use the word moderno, in Italian, and the difficulty he spotted with the modern mind is its limited capacity to relate to the whole of reality, particularly the spiritual aspects. This might sound surprising, given that his masterpiece, the Divine Comedy, is often described as one of the most brilliant creations of the medieval imagination. It is taken to be a genius expression of a discarded worldview, not the modern one, from an era in which everything was taken to be connected to the supreme reality called God. But Dante was born in a time of troubling transition. He realised that this cosmic vision was being challenged, and he didn’t seek to reject it or restore it, but to remake it.
The scale of this ambition partly explains why he wrote his three-part narrative journey – through hell (Inferno), purgatory (Purgatorio) and paradise (Paradiso) – in Italian, for a mass audience, not just the Latin-reading literati. The Divine Comedy was an instant hit. Hundreds of early manuscripts of the work survive, and people were soon demanding public readings of it. And it has continued to excite the imaginations of more recent poets, from T S Eliot to Clive James, as well as artists from William Blake to my favourite contemporary illustrator, Monika Beisner. Dante takes you somewhere you didn’t previously know. He does that because his epic verse is a self-conscious response to a shifting consciousness with which, in many ways – particularly when it comes to meaning – we are still wrestling…
At 700, Dante’s Divine Comedy is as modern as ever – a lesson in spiritual intelligence that makes us better at being alive. Mark Vernon (@platospodcasts) explains: “The Divine Dante.”
See also, “Mary Jo Bang Wonders Why It Takes So Long to Meet Beatrice in Dante’s Inferno,” in which the author ponders Dante’s modernity in a different dimension:
Several times in Purgatorio, Virgil defers to her when he reaches the limits of his pagan knowledge and can’t answer Dante’s questions, each time saying something like, “I’ve told you all I know. Ask Beatrice when you see her.” I took Virgil’s deference at face value: she’s Christian, she has Christian faith, she’ll know what a pagan can’t fathom. Of course, that was my mistake. Each time the poet Dante has Virgil say “ask Beatrice,” he is laying the groundwork for a character so psychologically astute that she’s nothing short of amazing…
As a character, she’s truly ahead of her time, and further proof that Dante as a poet was ahead of his. I was in awe watching her confront our hero and chip away at his defenses. It was like watching an old Perry Mason movie where we sit on the edge of our metaphoric seats as we get closer and closer to the complicated truth…
* Dante, Inferno, Canto 1
###
As we muse on modernity, we might send insightful birthday greetings to a thinker who wrestled in our times with many of the same challenges of modernity as Dante did in his: Jean Baudrillard; he was born on this date in 1929.
A sociologist, philosopher, cultural theorist, political commentator, and photographer, Baudrillard is best known for his analyses of media, contemporary culture, and technological communication, as well as his formulation of concepts such as simulation and hyperreality. He wrote widely– touching subjects including consumerism, gender relations, economics, social history, art, Western foreign policy, and popular culture– and is perhaps best known for Simulacra and Simulation (1981). Part of a generation of French thinkers that included Gilles Deleuze, Jean-François Lyotard, Michel Foucault, Jacques Derrida, and Jacques Lacan, with all of whom Baudrillard shared an interest in semiotics, he is often seen as a central to the post-structuralist philosophical school.
“Everything we care about lies somewhere in the middle, where pattern and randomness interlace”*…
We tend dramatically to underestimate the role of randomness in the world…
Arkansas was one out away from the 2018 College World Series championship, leading Oregon State in the series and 3-2 in the ninth inning of the game when Cadyn Grenier lofted a foul pop down the right-field line. Three Razorbacks converged on the ball and were in position to make a routine play on it, only to watch it fall untouched to the ground in the midst of them. Had any one of them made the play, Arkansas would have been the national champion.
Nobody did.
Given “another lifeline,” Grenier hit an RBI single to tie the game before Trevor Larnach launched a two-run homer to give the Beavers a 5-3 lead and, ultimately, the game. “As soon as you see the ball drop, you know you have another life,” Grenier said. “That’s a gift.” The Beavers accepted the gift eagerly and went on win the championship the next day as Oregon State rode freshman pitcher Kevin Abel to a 5-0 win over Arkansas in the deciding game of the series. Abel threw a complete game shutout and retired the last 20 hitters he faced.
The highly unlikely happens pretty much all the time…
We readily – routinely – underestimate the power and impact of randomness in and on our lives. In his book, The Drunkard’s Walk, Caltech physicist Leonard Mlodinow employs the idea of the “drunkard’s [random] walk” to compare “the paths molecules follow as they fly through space, incessantly bumping, and being bumped by, their sister molecules,” with “our lives, our paths from college to career, from single life to family life, from first hole of golf to eighteenth.”
Although countless random interactions seem to cancel each another out within large data sets, sometimes, “when pure luck occasionally leads to a lopsided preponderance of hits from some particular direction…a noticeable jiggle occurs.” When that happens, we notice the unlikely directional jiggle and build a carefully concocted story around it while ignoring the many, many random, counteracting collisions.
As Tversky and Kahneman have explained, “Chance is commonly viewed as a self-correcting process in which a deviation in one direction induces a deviation in the opposite direction to restore the equilibrium. In fact, deviations are not ‘corrected’ as a chance process unfolds, they are merely diluted.”
…
As Stephen Jay Gould famously argued, were we able to recreate the experiment of life on Earth a million different times, nothing would ever be the same, because evolution relies upon randomness. Indeed, the essence of history is contingency.
Randomness rules.
…
Luck matters. A lot. Yet, we tend dramatically to underestimate the role of randomness in the world.
The self-serving bias is our tendency to see the good stuff that happens as our doing (“we worked really hard and executed the game plan well”) while the bad stuff isn’t our fault (“It just wasn’t our night” or “we simply couldn’t catch a break” or “we would have won if the umpiring hadn’t been so awful”). Thus, desirable results are typically due to our skill and hard work — not luck — while lousy results are outside of our control and the offspring of being unlucky.
Two fine books undermine this outlook by (rightly) attributing a surprising amount of what happens to us — both good and bad – to luck. Michael Mauboussin’s The Success Equation seeks to untangle elements of luck and skill in sports, investing, and business. Ed Smith’s Luck considers a number of fields – international finance, war, sports, and even his own marriage – to examine how random chance influences the world around us. For example, Mauboussin describes the “paradox of skill” as follows: “As skill improves, performance becomes more consistent, and therefore luck becomes more important.” In investing, therefore (and for example), as the population of skilled investors has increased, the variation in skill has narrowed, making luck increasingly important to outcomes.
On account of the growth and development of the investment industry, John Bogle could quite consistently write his senior thesis at Princeton on the successes of active fund management and then go on to found Vanguard and become the primary developer and intellectual forefather of indexing. In other words, the ever-increasing aggregate skill (supplemented by massive computing power) of the investment world has come largely to cancel itself out.
…
After a big or revolutionary event, we tend to see it as having been inevitable. Such is the narrative fallacy. In this paper, ESSEC Business School’s Stoyan Sgourev notes that scholars of innovation typically focus upon the usual type of case, where incremental improvements rule the day. Sgourev moves past the typical to look at the unusual type of case, where there is a radical leap forward (equivalent to Thomas Kuhn’s paradigm shifts in science), as with Picasso and Les Demoiselles.
As Sgourev carefully argued, the Paris art market of Picasso’s time had recently become receptive to the commercial possibilities of risk-taking. Thus, artistic innovation was becoming commercially viable. Breaking with the past was then being encouraged for the first time. It would soon be demanded.
Most significantly for our purposes, Sgourev’s analysis of Cubism suggests that having an exceptional idea isn’t enough. For radical innovation really to take hold, market conditions have to be right, making its success a function of luck and timing as much as genius. Note that Van Gogh — no less a genius than Picasso — never sold a painting in his lifetime.
As noted above, we all like to think that our successes are earned and that only our failures are due to luck – bad luck. But the old expression – it’s better to be lucky than good – is at least partly true. That said, it’s best to be lucky *and* good. As a consequence, in all probabilistic fields (which is nearly all of them), the best performers dwell on process and diversify their bets. You should do the same…
As [Nate] Silver emphasizes in The Signal and the Noise, we readily overestimate the degree of predictability in complex systems [and t]he experts we see in the media are much too sure of themselves (I wrote about this problem in our industry from a slightly different angle…). Much of what we attribute to skill is actually luck.
Plan accordingly.
Taking the unaccountable into account: “Randomness Rules,” from Bob Seawright (@RPSeawright), via @JVLast
[image above: source]
* James Gleick, The Information: A History, a Theory, a Flood
###
As we contemplate chance, we might spare a thought for Oskar Morgenstern; he died on this date in 1977. An economist who fled Nazi Germany for Princeton, he collaborated with the mathematician John von Neumann to write Theory of Games and Economic Behavior, published in 1944, which is recognized as the first book on game theory— thus co-founding the field.
Game theory was developed extensively in the 1950s, and has become widely recognized as an important tool in many fields– perhaps especially in the study of evolution. Eleven game theorists have won the economics Nobel Prize, and John Maynard Smith was awarded the Crafoord Prize for his application of evolutionary game theory.
Game theory’s roots date back (at least) to the 1654 letters between Pascal and Fermat, which (along with work by Cardano and Huygens) marked the beginning of probability theory. (See Peter Bernstein’s marvelous Against the Gods.) The application of probability (Bayes’ rule, discrete and continuous random variables, and the computation of expectations) accounts for the utility of game theory; the role of randomness (along with the behavioral psychology of a game’s participants) explain why it’s not a perfect predictor.
“They swore by concrete. They built for eternity”*…
Understanding how the materials we use work– and don’t work– together…
For most of a red swamp crayfish’s life, cambarincola barbarae are a welcome sight. Barbarae – whitish, leech-like worms, each a couple of millimeters long – eat the swamp scum off the crayfish’s shells and gills, and in most cases improve the crayfish’s health and life expectancy. Together, barbarae and crayfish form a mutualistic symbiotic relationship. Both species benefit from their cohabitation, and barbarae have evolved to the point where their entire life cycle, from egg to adult, occurs while attached to a crayfish.
But their symbiosis is contextual – a tentative truce. Young crayfish (who molt their shells more frequently and therefore accumulate less scum) don’t need much cleaning, and will take pains to remove barbarae from their shells. And even when molting has slowed and a crayfish has allowed the symbiosis to flourish, there are limits to barbarae’s loyalty: If there isn’t enough food for them to survive, they’ll turn parasitic, devouring their host’s gills and eventually killing them.
Like symbioses, composite materials can be incredibly productive: two things coming together to create something stronger. But like crayfish and barbarae, their outcomes can also be tragic. Rarely are two materials a perfect match for each other, and as the environment changes their relationship can turn destructive. And when composites turn destructive – as was evident in the reinforced concrete when the Champlain Towers North were inspected back in 2018 – the fallout can be catastrophic.
The history of what we now call composite materials goes back many thousands of years. For modern consumers, the most common composites are fiber-reinforced plastics (the colloquial “carbon fiber” and “fiberglass”), but perhaps the first composites in history were reinforced mud bricks. The Mesopotamians learned to temper their bricks by mixing straw into them at least as early as 2254 BC, increasing their tensile strength and preventing them from cracking as they dried. This method continues around the world today.
But by far the most commonly used composite material in history is steel-reinforced concrete. Roman concrete usage started as early as 200 BCE, and almost three centuries later Pliny the Elder included a note about what appears to be high quality hydraulic concrete in his Naturalis Historiae. These recipes were subsequently forgotten, and the material largely disappeared between the Pantheon and the mid nineteenth century. Modern concrete involves some legitimate process control: limestone and other materials are heated to around 900° C to create portland cement, which is then pulverized and mixed with water (and aggregate) to create an exothermic reaction resulting in a hard and durable object. The entire process consumes vast amounts of power and produces vast amounts of carbon dioxide, and the industry supporting it today is estimated to be worth about a half a trillion dollars.
But in spite of the fortunes that have been invested in the portland cement process (as well as in a wide range of concrete admixtures, which are used to tune both the wet mixture and the finished product), the true magic of contemporary concrete is the fact that it is so often reinforced with steel – dramatically increasing its tensile strength and making it suitable for a wide range of structural applications. This innovation arose in the mid-nineteenth century, when between 1848 and 1867 it was developed by three successive Frenchmen. In the late 1870s, around the time that the first reinforced concrete building was built in New York City, the American inventor Thaddeus Hyatt noted a critical quality of the material: through some fantastic luck, the coefficients of thermal expansion of steel and concrete are strikingly similar, allowing a composite steel-concrete structure to withstand warm/cool cycles without fracturing. This quality opened up the floodgates, and in the 1880s the pioneering architect-engineer Ernest Ransome built a string of reinforced concrete structures around the San Francisco Bay Area. From there it was history.
More than any other physical technology, it is reinforced concrete that defines the 20th century. Versatile, strong, and (relatively) durable, the material is critical to life and industry as we know it. Reinforced concrete was the material of choice of Albert Kahn, who with Henry Ford defined 20th century industrial architecture; reinforced concrete is a key part of nearly every type of logistical infrastructure, from roads to bridges to container terminals; reinforced concrete makes up the literal launch pads for human space travel. It’s a critical component of power plants, dams, wind turbines, and the vast majority of mid- to late-twentieth century homes and apartment buildings. Its high compressive strength makes it ideally suited for footings and foundations; its high tensile strength lets it cantilever and span great distances easily.
But reinforced concrete is really only 140 years old – the blink of an eye, as far as the infrastructure of old is concerned. The Pantheon was built around 125 CE, by which time the Romans had been experimenting with concrete construction for well over 300 years. When we see the Pantheon, we’re seeing a mature method – a technology with full readiness, being used in an architectural style that’s tuned for its physical properties.
By contrast, even our most iconic steel-reinforced concrete buildings are prototypes…
Early on in the history of steel-reinforced concrete, it was known that the high alkalinity of concrete helped to inhibit the rebar from rusting. The steel was said to be sealed within a monolithic block, safe from the elements and passivated by its high pH surroundings; it would ostensibly last a thousand years. But atmospheric carbon dioxide inevitably penetrates concrete, reacting with lime to produce calcium carbonate – and lowering its pH. At that point, the inevitable cracks and fissures allow the rebar inside to rust, whereupon it expands dramatically, cracking the concrete further and eventually breaking the entire structure apart.
This process – carbonatation, followed by corrosion and failure – was often visible but largely ignored into the late twentieth century. Failures in reinforced concrete structures were often blamed on shoddy construction, but the reality is that like the crayfish and the barbarae, the truce between concrete and steel is tentative. What protection concrete offers steel is slowly eaten away by carbonatation, and once it’s gone the steel splits the concrete apart from the inside…
There are of course many potential innovations to come in reinforced concrete. Concrete mixtures made with fly ash and slag produce high strength and durable structures. Rebar rust can be mitigated by using sacrificial anodes or impressed current. Rebar can be made of more weather resistant materials like aluminum bronze and fiberglass. Or the entire project could be scrapped – after all, the CO2 emitted by the cement industry is nothing to thumb your nose at. Whatever we do, we should remember that the materials we work with are under no obligation to get along with one another – and that a symbiotic truce today doesn’t necessarily mean structural integrity tomorrow.
On composites, crayfish, and reinforced concrete’s tentative alkalinity: “A Symbiotic Truce,” from Spencer Wright (@pencerw), whose newsletter, “The Prepared” (@the_prepared), is always an education.
* Gunter Grass
###
As we delve into durability, we might recall that it was on this date in 315 that the Arch of Constantine officially opened. A triumphal arch in Rome dedicated to the emperor Constantine the Great, it was constructed of Roman concrete, faced with brick, and reveted in marble.
Roman concrete, like any concrete, consists of an aggregate and hydraulic mortar – a binder mixed with water (often sea water) that hardens over time. The aggregate varied, and included pieces of rock, ceramic tile, and brick rubble from the remains of previously demolished buildings. Gypsum and quicklime were used as binders, but volcanic dusts, called pozzolana or “pit sand”, were favored where they could be obtained. Pozzolana makes the concrete more resistant to salt water than modern-day concrete.
The strength and longevity of Roman marine concrete is understood to benefit from a reaction of seawater with a mixture of volcanic ash and quicklime to create a rare crystal called tobermorite, which may resist fracturing. As seawater percolated within the tiny cracks in the Roman concrete, it reacted with phillipsite naturally found in the volcanic rock and created aluminous tobermorite crystals. The result is a candidate for “the most durable building material in human history.” In contrast, as Wright notes above, modern concrete exposed to saltwater deteriorates within decades.
“Anonymity is the fame of the future”*…
So… late last spring, a strange, beguiling novel began arriving, in installments, in the mail, addressed to writer Adam Dalva at his parents’ apartment. Who had written it?…
It arrived at the height of the pandemic, in a brown envelope with no return address and too many stamps, none of which had been marked by the post office. It was addressed to me at my parents’ New York City apartment, where I haven’t lived in more than a decade. My mother used the envelope as a notepad for a few weeks, then handed it off to me in July; it was the first time I’d seen her after months of quarantine. Inside the envelope was a small, stapled book—a pamphlet, really—titled “Foodie or The Capitalist Monsoon that is Mississippi,” by a writer named Stokes Prickett. On the cover, there was a photograph of a burrito truck and a notice that read “Advance Promotional Copy: Do Not Read.” The book began with a Cide Hamete Benengeli-style introduction attributed to a Professor Sherbert Taylor. Then a fifty-five-page bildungsroman written in short sections with boldface titles. The prose reminded me a bit of Richard Brautigan.
Because I write book reviews, dozens of unsolicited books are sent to my house every month. Many of them, I confess, barely catch my attention before they’re added to a stack on the floor. But I sat down and read this one all the way through. The narrator of “Foodie” is Rusty, who thinks back on his days in high school, when he worked as a thumbtack-maker’s apprentice, then in a floor-mat factory. Rusty meets another kid from school, an idealist called Foodie whose real name is Gourmand, and whom Rusty describes as “a tetherball champ, a king of the taco stands,” in a town “at the edge of the 8-track suburbs.” Foodie, Rusty says, “was the kindest werewolf on the warfront, and I was his hairdresser.” They start spending time with a hulking, ruthless classmate named Dale, who is “right-handed and immoral as parchment,” and fated to die young because he has a white-collar job that causes him to move through time more quickly than his friends do. After Dale’s death, Foodie and Rusty part ways.
The book was good. But who was Stokes Prickett, and how did this person get my parents’ address?…
A most marvelous mystery, solved by @adalva: “On the Trail of a Mysterious, Pseudonymous Author.”
###
As we get to the bottom of it, we might recall that it was on this date in 1901 that William Sydney Porter was released (on good behavior) after serving three years in the Ohio Penitentiary for bank fraud and embezzlement; a licensed pharmacist, he had worked in the prison’s infirmary. But on his release, he turned to what had been a pastime, writing. Over the next several years he wrote 381 short stories under the pen name by which we know him, “O. Henry,” including a story a week for over a year for the New York World Sunday Magazine.
His wit, characterization, and plot twists– as evidenced in stories like “The Gift of the Magi” and “The Ransom of Red Chief”– were adored by his readers but often panned by critics… though academic opinion has since come around: O. Henry is now considered by many to be America’s answer to Guy de Maupassant.
You must be logged in to post a comment.