You and I REALLY had some misspent youth Mark!! COSI in Columbus had a 3 story Foucault too with a beautiful inlaid marble compass rose at the base where they set the pegs up. Like you, I spent much time just watching and thinking about it.

Bruce---didn't Feynman's work in quantum mechanics involve movement around a center point, as in a spinning disc? As I recall he first began thinking of it watching a plate sail across a college cafeteria.

Spaw