You smell it before you see it. A warm, green dampness mingles with coal smoke and horse dung as your cab turns off Knightsbridge — and then, through the trees, something impossible catches the light. Not stone. Not brick. A shimmer. A mountain of glass rising from Hyde Park as though God had left a greenhouse behind.

It is the first of May, 1851. Queen Victoria, twenty minutes from now, will declare open the Great Exhibition of the Works of Industry of All Nations. You have paid a shilling — a working man's daily wage — for the privilege of being here today. All around you: factory girls from Manchester, silk merchants from Lyon, rajahs from Calcutta, a party of Prussian industrialists consulting a map they cannot read, and a Scottish farmer who has never been to London before and will never come again. Six million of you will pass through these doors before October. Right now, you are simply trying not to trip over your feet as you stare upward.

The building itself is the first wonder. Joseph Paxton — a gardener, not an architect — designed it in ten days on a sheet of blotting paper. The newspapers called it the Crystal Palace, and the name stuck because nothing else fit. It is 563,000 panes of plate glass stretched over a lattice of prefabricated iron columns, covering nineteen acres of the park. Three full-grown elm trees stand inside it, their crowns brushing the arched transept roof as though the forest itself was invited to attend. Wrens nest in the rafters. On warm days the interior shimmers with refracted light, and visitors report feeling slightly giddy, unsure whether they are indoors or not.

The building was controversial before the first brick was laid — except there are no bricks. The critics called it a giant cucumber frame. The poet William Morris thought it monstrous. Colonel Sibthorp, a Member of Parliament who made a career of opposing everything modern, warned Parliament that foreign riff-raff would pour through England's gates and corrupt public morals. He was not entirely wrong about the riff-raff, if one counts six million people from every corner of the globe as riff-raff.

The contents were arranged by nation. Britain and her colonies claimed the eastern half; the rest of the world filled the west. To walk through the Exhibition was to walk through the Victorian idea of everything that existed and everything that could be made.

There was the Koh-i-Noor diamond, arrived recently and controversially from India under the terms of the Second Anglo-Sikh War. It sat under a gilded cage in the centre of the nave, lit by gas jets, and it disappointed almost everyone who saw it. The cut was wrong, they said; it looked dull. A man from Amsterdam offered to recut it. Eventually he did. There was a hydraulic press capable of lifting a thousand tons, running continuously, just to show it could. There were false teeth made of porcelain, a knife with seventy-three blades, an alarm bed that tipped its occupant onto the floor at a preset hour, a set of garden furniture carved from coal, a model of Liverpool docks in cork, and a knife and fork designed for a one-armed gentleman. There were rifles and steam engines and carpets of impractical splendour and a "sportsman's knife" with eighty blades and an attachment for removing stones from a horse's hoof.

But the thing that stopped people mid-step, the thing that appeared in almost every diary and letter from the period, was simpler than any of it: an enormous fountain of pink crystal in the centre of the transept, rising four metres, perpetually running, casting little rainbows onto the crowds below. Women fainted near it. Men removed their hats. It was the most photographed object of the exhibition. Nobody is quite sure why it moved people so deeply — perhaps because, in a hall full of things that demonstrated what human hands could do, the fountain just was.

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Prince Albert — the driving force behind the Exhibition and the man who would not live to see its legacy secured — described it as a realisation of the unity of mankind. This was sincerely meant, and almost entirely self-serving. The Exhibition was also, unmistakably, a display of imperial power.

The colonies were not invited as equals. India's vast section displayed silks, ivories, spices and jewels — including the Koh-i-Noor — as tribute rather than commerce. The message was clear enough: Britain had gathered the wealth of the world into one park in London and placed it under a glass roof for the edification of the public. The phrase used in official literature was "works of industry of all nations." The reality was that many of those nations did not send their exhibits voluntarily. The Indian display was curated by the East India Company, which had ruled the subcontinent as a private enterprise for two centuries.

Closer to home, the inequality was quieter but no less real. A shilling admission was not nothing in 1851: it was roughly three hours' wages for an agricultural labourer. When the organisers dropped the price to a penny on "working class days," the crowds that came were enormous and, according to multiple contemporary accounts, perfectly well-behaved — which surprised commentators who had expected otherwise, and tells you rather a lot about what commentators thought. The working classes, it turned out, were as capable of marvelling at a crystal fountain as anyone else. They filled notebooks with sketches. They wrote letters home. A Staffordshire factory worker named Eliza Cook attended and wrote a poem about it that was published in a penny paper and read by thousands.

What they saw was a vision of progress that the Industrial Revolution had made possible — and which the Industrial Revolution's worst conditions had produced. The cotton in the textile halls came from plantations in the American South, picked by enslaved people. The iron in the exhibits had been smelted by men working twelve-hour shifts in conditions that killed them by degrees. The empire that made Britain the workshop of the world was not visible in the Exhibition's displays. It was visible in the displays themselves.

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The Exhibition closed on the eleventh of October, 1851. In its 141 days, it received more visitors than any event in human history to that point. It inspired dozens of imitations across Europe and America, and the "World's Fair" format became a defining institution of the century that followed. The Crystal Palace was disassembled and moved to Sydenham, where it served as a concert hall, theatre, and public garden until it burned in 1936, lighting the sky of south London like a second sun.

What is it, exactly, that we are looking at when we look at the Great Exhibition of 1851? It was a moment of genuine wonder — people who had never seen a steam locomotive standing in front of a steam locomotive, not in a factory but in a garden, in glass and light, and feeling something shift. It was a propaganda exercise of staggering ambition, a display of imperial confidence at the precise moment before confidence began to fray. It was a commercial operation dressed as a cultural institution. It was a place where a working-class girl from the Potteries and a Maharajah's envoy could stand side by side in front of a pink crystal fountain and both feel small in the same way.

History rarely gives us a single moment that contains everything. The Great Exhibition comes unusually close. In those nineteen acres of glass and iron, for five months in the summer of 1851, Victorian Britain put everything it thought about itself on display — and left us, a century and a half later, still arguing about what it meant.

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