That's still pretty interesting. One of the students came up with something similar which was simply two rotating drums, both with numbers printed on the outside, one of which being numbered 00 to 59, the other numbered 1 to 12. It was arranged so that when the drum rotated to as far as 59, it began to rotate the hour drum to the next number, and by the time the minute drum had reached 00 again, the hour had fully changed.
That was just one of the simpler ones. The top scorer out of all the designs was a perpetual permanent magnet motor powered clock, that had a really seriously funky design. It looked like a Giger piece.
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