K'nex programmable automaton based on Hero's

Back in 2007, I posted about a recreation of an invention by Hero (or Heron) of Alexandria -- a working model of a self-propelled, programmable cart that was used on the theater stage. Here is an instructable about how to make something similar out of K'nex construction toys.

If you or someone you know wants to make this or a million other crazy contraptions, here's where you can get K'NEX construction toys.

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