From Grand Illusions.

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A wobbler! This one has YES and NO engraved on it, and also NOW and LATER. So as well as being an elegant mover, it can help with your decision making!

Then a wire version of the wobbler, made by the late Rick Flowerday. Rick, who was originally from the USA, lived in West London for some years, and Tim got to know him during that time.

Tim then demonstrates some more of Rick’s amazing topological inventions.