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bhrgunatha  ·  1652 days ago  ·  link  ·    ·  parent  ·  post: Marble races are strangely compelling

I do like the sand courses

Question for the boffins - how do you carve out the sand courses at an angle to make sure the marbles competitors follow the complete course in the right speed range? They don't look like they've been dug out deep or built up high.