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Fifty-seven years ago, while on the Apollo 9 mission orbiting Earth, astronaut Rusty Scheickart was floating outside the capsule in his space suit and had a moment to look out through his “fishbowl” helmet at the planet under him. 

“And you look down there,” he said, “and you can’t imagine how many borders and boundaries you cross, again and again and again [as you orbit the Earth every 90 minutes]. And you don’t even see them.” 

It’s a common refrain from those who have gone to space. Moon astronaut Buzz Aldrin said, “From space there were no observable borders between nations, no observable reasons for the wars we were leaving behind.”

Senator Bill Nelson, who flew on the Space Shuttle Columbia in 1986, said, “In space, you don’t see boundaries or borders. We are all citizens of Earth.”

The blue marble

We draw lines where there aren’t any. National borders are just one case. We draw distinct lines between species in biological taxonomy, we name historical eras, invent racial exclusions — we talk about these arbitrary lines as if they build fences between property lines. But they are legal fictions, and continually malleable. Political borders shift; taxonomy rejumbles categories; Red politicians vs blue politicians? Really they are all just grey men in blue suits. Their squabbles are parochial at best. 

The issue is that we understand the world in discrete chunks, but nature comes in indistinct swathes. In order to discuss or argue, we pretend there are clear lines. Perhaps we have to; everything all together at once is confusing. 

Robert Rauschenberg “Lucky Dream”

Nature, however draws few lines. It spreads and includes. It changes constantly; it is never static. “Everything flows,” as Heraclitus put it. Seed into sprout into flower and into seed into … 

I’m not saying there are no differences at all, but rather that the lines we draw tend to be arbitrary or at least, blurry. Are the red people for smaller government or a more powerful presidency? Such issues shift over time and it’s impossible to pin them down. 

Take the past, for instance. Historians like to take big chunks of time and give them names: Classical, Postclassical, Late Medieval, Romantic, and so on. Then they argue over it all, because any good academic historian knows that the names we give big chunks of time are misleading. But, as they say, whatcha gonna do? We seem to be stuck with them. 

The Middle Ages, for instance. Middle of what? Homo sapiens developed something like — in a common low-end estimate — 300,000 years ago, putting the start of the Middle Ages somewhere approximately in the last 15/3000ths of human history. Not exactly the middle.

And the dates we give the Middle Ages vary widely. Where do you draw the line? It came after the Roman Empire. But when did the Roman Empire fall? Well, you can say that the final collapse came in 1453 with the fall of Constantinople. For some people, that is already the Renaissance, squeezing out the Middle Ages entirely. And no one really believes the Byzantine Empire was genuinely Roman. They spoke Greek, for god’s sake. They were Christian.

Usually, when we talk of the fall of Rome, we mean the Western Roman Empire and the sad reign of Romulus Augustulus, which came to an end in AD 476. But really, the Western Roman empire at the time consisted only of most of Italy, a tiny bit of France, and Dalmatia (later aka Yugoslavia, later still — well, you know).

And you could easily argue that Rome ceased to be Roman after Constantine converted to Christianity and legalized it in AD 313. After that, the slow slide from Roman imperialism into Medieval feudalism began its ambiguous transubstantiation.

It is the great paradox of scholarship: The more you read, the more your ignorance grows: The more you learn about something, the more you discover how little you know. 

We think of our current era as modern. But when did that begin? It is a slippery question. I am reminded of the time, some 50 years ago, when I first drove west from North Carolina. I had never seen the great American West and eagerly anticipated finding it. It must be so different, I thought, so distinct.

We were living in Boone, N.C., named for Daniel, who trod those mountains in the 1700s, when anything beyond the Blue Ridge was the West. When George Washington surveyed the Northwest Territory in the late 1740s, he was measuring out what became Ohio.

Blue Ridge

So, when I was driving, I knew I had already pushed my own frontier past such things, and knew in my heart that the West began on the other side of the Mississippi River. But, when I crossed the river into Arkansas, it hardly seemed Western. It didn’t look much different from Tennessee, in my rear view mirror. Yet, Arkansas was home to the “Hanging Judge” Isaac Parker and where Jesse James robbed trains.

But surely Texas was the West, but driving through flat, bland Amarillo on I-40 was as exciting as oatmeal. The first time we felt as if we had hit the West was at the New Mexico line, when we first saw a landscape of buttes and mesas. Surely this was the West.

Maybe, but we hadn’t yet crossed the Continental Divide. All the waters of all the rivers we crossed emptied into the Atlantic Ocean. Finally, crossing the Divide near Thoreau, N.M., we felt we had finally made it.

Yet, even when we got to Arizona, we knew that for most of the pioneers who crossed this country a century and a half ago, the desert was just one more obstacle on the way to California. In some sense it still wasn’t the West.

When we got as far as we could in a Chevy, and stared out at the Pacific Ocean, we knew that there was still something farther: Hawaii, Japan, China, India, Africa — and eventually across the Atlantic to Cape Hatteras and back to North Carolina.

So, the West wasn’t a place you could ever really reach, but a destination beyond the horizon: Every point on the planet is the West to somewhere else.

When we look to find the beginnings of Modernity, the horizon recedes from us the same way. Perhaps it began with World War I, when we entered a non-heroic world and faced a more sober reality.

Modern Art began before that, however, perhaps with Stravinsky’s Rite of Spring in 1913, perhaps with Debussy’s Afternoon of a Faun in 1894. Some begin with the first Impressionist exhibition in 1874.

Politically, maybe it begins with Bismarck and the establishment of a new order of nations and the rise of the “balance of power.”

You can make a case that Modernism begins with the Enlightenment in the 18th century, when a rising Middle Class began to fill concert halls and Mozart became an entrepreneur instead of an employee of the aristocracy.

Or before that, in 1648, with the Treaty of Westphalia, and the first recognition of national boundaries as something more than real estate owned by the crown.

You can set your marker down with Luther, with Gutenberg, with Thomas Browne, Montaigne, Caravaggio — or Giotto.

For many, Modernism began with the Renaissance, but when did the Renaissance begin? 15th century? The Trecento? Or did it begin further north with the Gothic around AD 1150, which is really the first sparking of a modern way of thinking. 

Perhaps, though, it is the Roman republic that divides modern political organization from more tribal eras before. Or you could vote for the democracy and philosophy of ancient Greece. Surely the time before that and the the time after are distinctly different. We recognize the near side of each of these divides as more familiar than the distant side.

You might as well put the starting line with the discovery of agriculture in the steppes of Anatolia and the river plains of Iraq. An argument can be made for any of these points on the timeline — and arguments could be made for many I haven’t room to mention.

Which leaves us the ultimate question: Is Modernism now over? Done with? Have we moved on, or is what we deem Postmodernism really just the next manifestation of the Modern? Perhaps AI is the new line drawn in history. 

Perhaps the horizon should be recognized for what it is: an ever-moving phantasm. For those peasants digging in the manorial dirt in the Ninth Century, the times they were living in were modern. The first person recorded to use the term “modern” for his own age was the Roman writer Cassiodorus in the 6th Century. Each moment is the new modern.

Scholars know all this very well, and make their arguments in books and treatises, almost always with the caveat about drawing lines hard and fast. But the convenience of giving names is too seductive, and leaves the popular imagination with images like Monty Python’s “Bring out yer dead” or Elizabeth Taylor’s Cleopatra. Can we talk about the past without the labels we give it? 

We need to understand the world is not binary, but a borderless spectrum of experience. Hawaii is now part of North America and Iceland is part of Europe. Electrons are particles and waves. Poland grew immense and shrunk, disappeared completely and reappeared and picked up its skirts and moved 200 miles to the west. And so, I wince every time I hear a red politician tell us with misbegotten certainty what gender roles should be, or that “male” and “female” are hard, definable categories with no subtleties. Or that “Left” and “Right” are hard-and-fast places where we must construct our redouts. 

I admit we need words, categories, borders, and definitions to be able to communicate. We need to cut up our steak in order to eat it. But I would wish we could be more humble about their actual reality. 

My daughter, Susie, is a scant five feet tall. She went to the University of North Carolina at the same time as six-foot-six-inch Michael Jordan. One day, they both got in an empty dorm elevator together. The door closed; one looked up, one looked down and they both spontaneously started laughing. 

Scale is important.

And no matter how many times you’ve seen Monet’s waterlilies in books, on computer screens or in slide shows, you are not prepared for the wallop they have in person at the Orangerie. They spread out across your vision from one peripheral side to the other.

Scale matters.

In 1972, Apollo 17 astronauts photographed the “Blue Marble” Earth from roughly 18,000 miles, giving us an image of the wet, watery ball we live on. It looks small and vulnerable — and it is, in the immensity of space. But it also gives a misleading impression of the scale of the planet.

Scientists may measure scale with numbers and exponents, but each of us, personally, can only conceptualize size and distance against our bodies and senses. Who of us can tell the immediate difference between 1011 and 1110? Which is the larger number? But between your fingers, you can tell which of two grains of sand is larger, merely by feel. 

In 2008, I drove from Phoenix, Ariz. to Reidsville, N.C., over a weekend, a trip of about 2,200 miles, or roughly 1/11th of the circumference of the globe. I left after work on a Friday and pulled in to Reidsville on Monday morning. I was hauling ass, as they say. On the Sunday, I drove 900 miles. The trip was exhausting, but gave me a palpable sense of the size of the world. I could feel it, because I drove over it.

(And, by the way, the world is not flat: I could see the great grain elevators of the Midwest rise from the curved horizon before me and, after I passed, watch them settle, like the setting sun, behind me.)

In 1989, I flew from Phoenix to South Africa, a flight that spent some 40 hours in the air. The popular image is that if you dig straight down in your back yard in America, you eventually hit China, but this isn’t so. Directly opposite Phoenix on the Great Blue Marble is a spot in the Indian Ocean just off the coast of South Africa. 

So my flight was literally to the antipodes. (It took so long because in that apartheid era, I had to take an especially roundabout route to my destination: Phoenix to Philadelphia, changing flights to Frankfurt, Germany, changing again to a South Africa Airlines flight that, because of opposition to apartheid, was not permitted to overfly most other nations in Africa, and so, had to fly out over the Atlantic, refuel in the Azores, and cruise over the water all the way to Namibia before finally landing in Johannesburg.) It took Lindbergh 33 hours to cross just the Atlantic.

Such a trip really gives you a sense of the scale of the planet.

Before air travel, however, such a voyage would take months, not hours, providing an even more body-interior feel for the distance. In 1967, I took a trans-Atlantic ocean liner to Europe, and the monotony of the unchanging sea, day to day, made the earth seem even larger. My trip took four days and a bit. It took Columbus more than two months to cross the Atlantic.

The point I am making with all this travel tale, is that scale, whether looking at Picasso’s Guernica, or watching the odometer while driving from Bangor to Seattle, is that scale is felt in the body, it is measured by human proportions. As Protagoras recognized in the Fifth Century BC, “Man is the measure of all things.”

When we look out at the night sky and realize we are at the bottom of a seemingly infinite and dark well, we can be awed, but we cannot feel in our bodies the inestimable size of the cosmos.

Yes, we can speak of it in abstractions. We can point out that Voyager I, now in interstellar space, is traveling at a speed of 17,000 miles per second — which would take about a second and a half to circle the Earth — and will cover 325 million miles in a year. Yet, at that speed, it would take it  some 45 thousand years to reach the nearest star. There is no way you can process that scale in your paltry human skin. We can talk in big words, like billions and trillions, but outside of abstract mathematical numbers, can you actually feel the difference between a billion miles and a trillion? They are meaningless words. You might as accurately call it a “gazillion.”

Do not misunderstand me. Humans have been amazing at understanding the cosmos intellectually. We can calculate the orbit of a satellite within what seems like a few inches. But I am not talking here about abstract reasoning.

There is a limit to the human imagination. We can calculate overwhelming numbers, but in terms of body knowledge — being able to physically conceptualize — such numbers turn into little more than words. 

We can use the math for engineering and for science, but we must recognize that our puny minds cannot get their arms around such boggling numbers. We are limited by the evolution of our human brains, which grew to process the daily income of sense data. We can feel the road under us as we speed along the interstate; we cannot feel the gap between Earth and Alpha Centauri. We can name it, but we cannot feel it. 

All trans-human scales are metamorphosed into a single size: Infinite, or might-as-well-be. It is what we feel when we turn our eyes up toward Orion or the Milky Way.

An earlier version of this essay appeared on the Spirit of the Senses website Oct. 2, 2018