Of course you're using gravity on a device built out of little slopes, just as the Turing Tumble is. Add a hand-cranked marble lift to a Turing Tumble and the two are practically equivalent.
Of course you're using gravity on a device built out of little slopes, just as the Turing Tumble is. Add a hand-cranked marble lift to a Turing Tumble and the two are practically equivalent.