"Impossible Bongard Problem" is a loose term, but it roughly means the Bongard Problem can't be displayed as an image.

BP868, the version of this whose examples are images of Bongard Problems (miniproblems), rather than links to pages on the OEBP, is impossible. - Aaron David Fairbanks, Jul 29 2020

See overriddensolution for Problem solutions that Bongard Problems can have, but that will not be chosen by a reasonable person as the best solution.

Adjacent-numbered pages:
BP816 BP817 BP818 BP819 BP820  *  BP822 BP823 BP824 BP825 BP826

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Leo Crabbe