The tracks of the train are a bit pinged up by spacetrash now, but still as beautiful as that famous photo: helices of carbon spiraling up out of the gravity well, product of insane mathematics and clever branding. Nobody wanted a space elevator; that’s where you get stuck while they play bad music.

But everybody gets excited on the way up a rollercoaster.

Another thing they took from coasters: gravity isn’t always down. Spin us fast enough and we’ll believe anything, thinks Lila, wishing for windows, even if they’d make her barf. Without scenery, it’s a long trip to the Moon.