Everyone was watching the bicycle.

In the spring of 1896 the share prices of British bicycle companies rose about two hundred percent in two months. The number of public companies connected to bicycles had been around twenty when the year started, and within roughly a year it was more than a hundred, headed toward a hundred and forty. A property dealer named Ernest Terah Hooley bought the Pneumatic Tyre Company for three million pounds — nearly ten times what it had been worth — renamed it Dunlop, and sold it a few weeks later for five million. The cycling press was ecstatic. One historian of the mania notes that much of the press would not have a bad word said about bicycles, and treated anyone who thought the shares were overvalued as somebody who simply did not understand the spectacular potential of the new technology.

Here’s the part that took me a while to sit with. The price of the bicycle itself barely moved. The bike they were all buying was the safety bicycle — diamond frame, chain drive, pneumatic tires — and it was finished. It looked like the bike in your garage. There was no breakthrough left to buy shares in, no product story changing month to month, and yet the stock index kept climbing while the actual machines sold at about the same price all year. What the mania was about was never the bicycle. It was the shares of bicycle companies. Then, in 1897, American mass-made bicycles arrived at twenty-five dollars — about five pounds, half the going British price — the British firms finally had to slash prices, and the arithmetic caught up with everyone. Forty of the hundred and forty companies went bankrupt by 1901. Sixty more folded or drifted off over the following decade. An index of bicycle stocks was down forty percent by December 1897 and traded, on average, seventy-one percent below its peak a year after that. It was not a crash so much as a slow puncture; the air took years to leave the tire.

The rage was bicycles — not the light bulb, not the camera, not the pen — bikes. The neighbors arrived anyway, almost in passing: Bell’s telephone patent, 1876. The phonograph, 1877. Edison’s practical electric lamp, 1879. The fountain pen, 1884. The automobile, 1886. The Kodak camera, 1888. X-rays in 1895, motion pictures in 1895, Marconi’s wireless telegraph in 1896, the airplane in 1903. That’s the list I can’t get over, and it’s the reason I wanted to write this note. The camera did catch on — snapshot photography became a craze of its own, with camera fiends forming clubs and publishing magazines — but it was second to the bicycle, and only the bicycle got the mania. The bike was visible and social: you could see your neighbor riding one, join a club, take photographs of each other doing it, and buy stock in it. The lamp and the pen shipped quietly into houses and offices. Nobody published a lamp-stock index.

I put some of this in the book without quite noticing I had. In chapter three the pod adopts a Gilbert and Sullivan song as its theme, and Gene — the office researcher, the one who files everything — comes back the following Monday with context. He notes that the London opening was in 1880, and then he walks through the period: the Rover safety bicycle, 1885, and the boom that followed in the eighteen-nineties, factories and races and patents, everybody wanting a bicycle. Then the inventions around the song — Edison’s practical electric lamp, 1879. The phonograph, 1877. Bell’s telephone patent, 1876. The Kodak camera would come in 1888. And the last line of his note is the one that gets me: Gene wanted us to have the whole period, and the period kept getting longer. The joke the chapter is built around is Chloe’s summary of the Major-General — a man who knows everything except his own century — and I laughed at it the way everyone does, before it occurred to me that the joke is on the reader too. Gene’s list contains exactly one mania. Everything else on it is furniture now.

I think about that when I read the coverage of the AI trade, because the shape is the same and so is the mistake in the framing. There is a mania in the shares — filings, index talk, valuations that require a new vocabulary — and the press has split exactly the way the cycling press did: one half refusing to say a bad word, the other half refusing to say a good one. The shares are the bicycle. The thing I keep watching instead is the boring product underneath, which is real and finished in its own way: an agent that answers a customer, reads the room twice, and remembers what happened between turns. Last week’s note was about Brad’s pauses, the wait you can feel the thinking through, and it was really about this — the part of any technology that actually carries the weight is never the part the mania is watching. The interesting question is not whether we’re in 1896. It’s which inventions are shipping quietly while everyone reads the ticker.

The history also settles the part people find scary. Seventy percent of the companies that participated in the bicycle boom ended up folding or leaving the field. The bicycle itself won. Everything that mattered about the bicycle — the frame, the chain, the commute, the freedom of it — survived the mania that was supposedly about it, and the companies that went bankrupt are now trivia, if that. Nobody can name them. Everyone in the world can ride a bike.

So that’s the note. The boom got the bicycle. The century got the light bulb, the camera, and the pen. When the current mania deflates — and it will deflate, the way they all do, more like a slow puncture than a bang — I’d bet the same split holds. The shares will be trivia. The thing nobody was watching, the agent answering a customer at two in the morning and remembering her by name next month, will be everywhere, and in twenty years it’ll be furniture, and someone will write a note wondering why the boom went to something else entirely.