Rick Gaehl on Nostr: "Stairs are a structure designed to bridge a large vertical distance between lower ...

"Stairs are a structure designed to bridge a large vertical distance between lower and higher levels by dividing it into smaller vertical distances. This is achieved as a diagonal series of horizontal platforms called steps which enable passage to the other level by stepping from one to another step in turn." (Wiki)
They were invented about 8,000 years ago.

I love stairwells. They always seem to have something of M.C. Escher about them...

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