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Rubik cubes. I've always had a pretty darn good comprehension of 3D space but those things are, scuse the pun, off the grid.
When I used to fly a lot in the US I got one and a 2 page cheat sheet downloaded from the Internet. At the end of a 2 hour flight I was able to do it from scratch comfortably in under 2 minutes and can still pick up a cube and solve it now (some 18 years later) although it's a bit tricky if I haven't done it for a month or so, so I keep a couple around at work/home offices and try to play with them at least a few times a week.
I can't be bothered to learn different algorithms to be able to do it faster.
Greenbank
@Kernowdreamer
Rubik cubes. I've always had a pretty darn good comprehension of 3D space but those things are, scuse the pun, off the grid.