Any Bongard Problem that allows a fully black box fits right.
Another version of this Bongard Problem could be made about adding white (erasure of detail) instead of black (addition of detail).
Another version could be made about adding one of either white or black (but not both).
https://en.wikipedia.org/wiki/Sorites_paradox
Bongard Problems tagged finishedexamples will fit right.
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Aaron David Fairbanks