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There should be a list of toys considered "physical", which demonstrate or make you think over certain physical principles/phenomena. And of course which could just amaze.

Related question at MSE is "Mathematical toys?"

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closed as not constructive by Qmechanic, dmckee Jul 11 '12 at 14:31

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

Big-lists are not constructive by default. Yes, excpetions have been made but those are exceptions. Take it up on meta if you feel there should be one in this case, but personally I'm agin' it. – dmckee Jul 11 '12 at 14:32
don't forget – Mike Dunlavey Jul 11 '12 at 18:24

Levitron --- toy that displays the phenomenon known as spin stabilized magnetic levitation. The most simple variant is the most amazing --- no batteries, no electronics --- it just flies! Magnet repulsion + gyroscopic stabilization.

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Rattleback behavior is quite tricky to explain.

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Apparently, Bohr and Pauli consider tippe tops to be fascinating.

enter image description here

Also, magnet behavior is quite tricky to explain.

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Stirling engines of all kinds. Low temperature Stirling engines can work on the heat from hot cup ("coffee cup stirling engine") or even from body heat.

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