Left-sorted examples have the keyword "blackwhite" on the OEBP.
Right-sorted examples have the keyword "blackwhiteinvariant" on the OEBP.
All examples are visual Bongard Problems that allow black to touch the bounding box (keyword bordercontent).
Adjacent-numbered pages: BP551 BP552 BP553 BP554 BP555  *  BP557 BP558 BP559 BP560 BP561
meta (see left/right), links, keyword, invariance, wellfounded
visualbp [smaller | same | bigger]
Leo Crabbe