Nine squares with different patterns (3 of them are sold black) in a big square.
The wave functions associated with the bound states of an electron in a hydrogen atom can be seen as the eigenvectors of the hydrogen atom Hamiltonian as well as of the angular momentum operator. (Wikimedia image © unknown author. License CC BY-SA 3.0. This content is excluded from our Creative Commons license. For more information, see https://ocw.mit.edu/fairuse.)
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