Am I embarrassed to report that I spent 90% of my childhood and adolescent leisure-time in the 1950s and early 1960s racing coloured marbles down a slope. Lining them up, for example, behind a crib board on a supported boardgame board, then lifting up the crib board ,,, letting them GO!… and see which rolled furthest on the carpet.
Endless hour after endless hour. I even named the marbles – split dark blue, thin red, big light blue, spot yellow… … …
I had a ‘Palace Corbie’ published story in 1996 about it… http://weirdmonger.blogspot.com/2007/03/piano-player-has-no-fingers-no-1.html