The World Turned Upside Down

Sensing what is up and down should be really straightforward. After all, it's such a vital thing to know. It guides how we walk, sit, stand, and tells us what things will fall over and where. But when you enter the old tilted shack on the side of a hill in Santa Cruz, California, your view of the world changes. Balls seem to roll uphill, a pendulum hangs off to one side, and people look like they're standing at impossible angles as if suspended by ropes.
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Newscientist From issue 2169 of New Scientist magazine, 16 January 1999, page 37