What makes us human? Doing pointless things for fun

When viewing cave paintings in the Sahara, one set of five-dot clusters defeated us. And then we realised why they were there.

Playfulness is what makes us human. Doing pointless, purposeless things, just for fun. Doing things for the sheer devilment of it. Being silly for the sake of being silly. Larking around. Taking pleasure in activities that do not advantage us and have nothing to do with our survival. These are the highest signs of intelligence. It is when a creature, having met and surmounted all the practical needs that face him, decides to dance that we know we are in the presence of a human. It is when a creature, having successfully performed all necessary functions, starts to play the fool, just for the hell of it, that we know he is not a robot.

I was once in the south-eastern Sahara, in Algeria, near the border with Libya, near a settlement called Djanet. There’s a range of mountains there called the Tassili n’Ajjer: bone dry, a thousand square miles of treeless rock. A few millennia ago before the climate changed, this was a fertile region where big game roamed and African bush people lived and hunted. They lived in caves and beneath big overhangs of rock. At night they painted scenes from their lives and their fantasies, daubed in black and ochre on the walls and ceilings. There are hundreds of such sites, many more still doubtless undiscovered, scattered through these mountains.

With my fellow expeditionaries, I stood beneath one of these overhangs, admiring the fine artwork, the beautiful lines of giraffes, buffaloes, gazelles and birdmen . . . you could usually recognise at once what was being depicted.

But one set of paintings – if you could call them that – defeated us. Across part of the rock ceiling was a series of five-dot clusters. The dots were of red ochre and simply crude blobs, varying in size but mostly a bit smaller than a penny. There were usually five, some blobs firmer than others, in nothing that looked like the shape of anything. We puzzled and puzzled.

Then – “Of course!” one of my comrades exclaimed. “Look!” And he jumped from the earth floor as high as he could, one hand above his head. His fingers, stretched up, could just touch the rock above. And we saw at once that if he’d daubed them in paint, the fingers and thumb would have left five blobs just like the ones we had been puzzling over.

All at once, it was clear. The bush people, lounging about after dark in their family shelter, perhaps around a fire – basically just hanging out – had been amusing themselves doing a bit of rock art. And perhaps with some leftover red paste, a few of the younger ones had had a competition to see who could jump highest and make their fingermarks highest up the overhang.

This was not even art. It called for no particular skill. It was just mucking about. And yet, for all the careful beauty of their pictures, for all the recognition of their lives from the vantage point of my life that was sparked in me by the appreciation of their artwork, it was not what was skilful that brought me closest to them. It was what was playful. It was their jumping and daubing finger-blobs competition that brought them to me, suddenly, as fellow humans across all those thousands of years. It tingled my spine.

Caprice. Frolic. Joke. Jest. Dance. This is the word cloud that takes me to what makes us human. The great German philosopher Friedrich Nietzsche said this: “. . . one must still have chaos in oneself to be able to give birth to a dancing star”. It is the chaos in ourselves that is divine. We can be trained to do almost anything, harnessed to almost any purpose. But there remains a wayward spark whose unpredictability lies in the fact that it is pointless. That is humanity.

An age is coming when machines will be able to do everything. “Ah,” you say, “but they will not be conscious.” But how will we know a machine is not conscious – how do we know another human being is conscious? There is only one way. When it starts to play. In playfulness lies the highest expression of the human spirit.

Matthew Parris’s latest book is “The Spanish Ambassador’s Suitcase” (Penguin, £9.99). This article is part of our series published in association with Radio 2’s Jeremy Vine show

Human nature: it is our playfulness and unpredictability that will always set us apart from machines. Image: Kevin Zacher

This article first appeared in the 30 October 2013 issue of the New Statesman, Should you bother to vote?

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Has this physicist found the key to reality?

Whenever we have ventured into new experimental territory, we’ve discovered that our previous “knowledge” was woefully incomplete. So what to make of Italian physicist Carlo Rovelli?

Albert Einstein knew the truth. “As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.” However good we are at maths – or theoretical physics – our efforts to apply it to the real world are always going to mislead. So perhaps we shouldn’t be surprised that reality is not what it seems – even when, like the Italian physicist Carlo Rovelli, you’ve done the maths.

It is a lesson we could certainly learn from the history of science. Whenever we have ventured into new experimental territory, we’ve discovered that our previous “knowledge” was woefully incomplete. With the invention of the telescope, for instance, we found new structures in space; Jupiter’s moons and sunspots were just the beginning. The microscope took us the other way and showed us the fine structure of the biological world – creatures that looked uninteresting to the naked eye turned out to be intricate and delicate, with scales and hooks and other minute features. We also once thought that the atom lacked structure; today’s technology, such as the particle colliders at the Cern research centre in Geneva and Fermilab in the United States, have allowed us to prove just how wrong that idea was. At every technological turn, we have redefined the nature of reality.

Unfortunately, we don’t yet have the technology to take the next step. The present challenge to physicists seeking to discover how things really are is to investigate our environment on a scale known as the “Planck length”. Rovelli tries to convey just how small this is. Imagine, he says, a walnut magnified until it is the size of the universe. If we were to magnify the Planck length by that much, we still couldn’t see it. “Even after having been enormously magnified thus, it would still be a million times smaller than the actual walnut shell was before magnification,” he tells us.

We simply cannot probe the universe at these scales using current methods, because it would require a particle accelerator the size of a small galaxy. So – for now, at least – our search for the nature of reality is in the hands of the mathematicians and theorists. And, as Einstein would tell us, that is far from ideal.

That is also doubly true when theoretical physicists are working with two highly successful, but entirely incompatible, theories of how the universe works. The first is general relativity, developed by Einstein over 100 years ago. This describes the universe on cosmic scales, and utterly undermines our intuition. Rovelli describes Einstein’s work as providing “a phantasmagorical succession of predictions that resemble the delirious ravings of a madman but which have all turned out to be true”.

In relativity, time is a mischievous sprite: there is no such thing as a universe-wide “now”, and movement through space makes once-reliable measures such as length and time intervals stretch and squeeze like putty in Einstein’s hands. Space and time are no longer the plain stage on which our lives play out: they are curved, with a geometry that depends on the mass and energy in any particular region. Worse, this curvature determines our movements. Falling because of gravity is in fact falling because of curves in space and time. Gravity is not so much a force as a geometric state of the universe.

The other troublesome theory is quantum mechanics, which describes the subatomic world. It, too, is a century old, and it has proved just as disorienting as relativity. As Rovelli puts it, quantum mechanics “reveals to us that, the more we look at the detail of the world, the less constant it is. The world is not made up of tiny pebbles, it is a world of vibrations, a continuous fluctuation, a microscopic swarming of fleeting micro-events.”

But here is the most disturbing point. Both of these theories are right, in the sense that their predictions have been borne out in countless experiments. And both must be wrong, too. We know that because they contradict one another, and because each fails to take the other into account when trying to explain how the universe works. “The two pillars of 20th-century physics – general relativity and quantum mechanics – could not be more different from each other,” Rovelli writes. “A university student attending lectures on general relativity in the morning, and others on quantum mechanics in the afternoon, might be forgiven for concluding that his professors are fools, or that they haven’t talked to each other for at least a century.”

Physicists are aware of the embarrassment here. Hence the effort to unite relativity and quantum mechanics in a theory of “quantum gravity” that describes reality at the Planck scale. It is a daunting task that was the undoing of both Einstein and his quantum counterpart Erwin Schrödinger. The two men spent the last years of their working lives trying to solve this problem, but failed to make any headway. Today’s physicists have some new ideas and mathematical intuitions, but they may also be heading towards a dead end. Not that we’ll find out for sure any time soon. If the history of science offers us a second lesson, it is that scientific progress is unbearably slow.

In the first third of his book, Rovelli presents a fascinating dissection of the history of our search for reality. The mathematical cosmology of Ptolemy, in which the Earth stood at the centre of the universe and the other heavenly bodies revolved around it, ruled for a thousand years. It was unfairly deposed: the calculations based on Copernicus’s sun-centred model “did not work much better than those of Ptolemy; in fact, in the end, they turned out to work less well”, the author observes.

It was the telescope that pushed us forward. Johannes Kepler’s painstaking obser­vations opened the door to the novel laws that accurately and succinctly described the planets’ orbits around the sun. “We are now in 1600,” Rovelli tells his readers, “and for the first time, humanity finds out how to do something better than what was done in Alexandria more than a thousand years earlier.”

Not that his version of history is perfect. “Experimental science begins with Galileo,” Rovelli declares – but there are any number of Renaissance and pre-Renaissance figures who would baulk at that claim. In the 12th century the Islamic scholar al-Khazini published a book full of experiments that he had used to test the theories of mechanics. The man who helped Galileo achieve his first academic position, Guidobaldo del Monte, also carried out many experiments, and possibly taught Galileo the craft.

It’s a small misjudgement. More ­irritating is Rovelli’s dismissal of any path towards quantum gravity but his own, a theory known as “loop quantum gravity”. He spends the last third of the book on explaining this idea, which he considers the “most promising” of all the assaults on the true ­nature of reality. He does not mention that he is in a minority here.

Most physicists pursuing quantum gravity give a different approach – string theory – greater chance of success, or at least of bearing useful fruit. String theory suggests that all the forces and particles in nature are the result of strings of energy vibrating in different ways. It is an unproven (and perhaps unprovable) hypothesis, but its mathematical innovations are nonetheless seeding interesting developments in many different areas of physics.

However, Rovelli is not impressed. He summarily dismisses the whole idea, characterising its objectives as “premature, given
current knowledge”. It’s a somewhat unbecoming attitude, especially when we have just spent so many pages celebrating millennia of ambitious attempts to make sense of the universe. He also strikes a jarring note when he seems to revel in the Large Hadron Collider at Cern having found no evidence for “supersymmetry”, an important scaffold for string theory.

As readers of his bestselling Seven Brief Lessons on Physics will know, Rovelli writes with elegance, clarity and charm. This new book, too, is a joy to read, as well as being an intellectual feast. For all its laudable ambition, however, you and I are unlikely ever to learn the truth about quantum gravity. Future generations of scientists and writers will have the privilege of writing the history of this particular subject. With theory ranging so far ahead of experimental support, neither strings nor loops, nor any of our other attempts to define quantum gravity, are likely to be correct. Reality is far more elusive than it seems.

Michael Brooks’s books include “At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise” (Profile)

Reality Is Not What It Seems: the Journey to Quantum Gravity by Carlo Rovelli. Translated by Simon Carnell and Erica Segre is published by Allen Lane (255pp, £16.99)

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 20 October 2016 issue of the New Statesman, Brothers in blood