3 thoughts on “Just when you think you’ve invented the perfect useless machine …

  1. The real trick is to have a graduate student operate the machine 1000 times, documenting every attempt in his lab book – then let the machine run away at 999.

  2. IIRC, a similarly infuriating machine was described in an early New Scientist, in the late 60s (it had a hand that popped out).

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