Left examples partition a pool of objects cleanly into two classes.
See BP509 (keyword "allsorted") for the version with links to pages on the OEBP instead of images of Bongard Problems.
The left side implies BP876left.
Adjacent-numbered pages: BP870 BP871 BP872 BP873 BP874  *  BP876 BP877 BP878 BP879 BP880
hard, challenge, meta (see left/right), miniproblems, creativeexamples, assumesfamiliarity, structure, presentationinvariant
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Aaron David Fairbanks