Left-sorted BPs have the keyword "left-null" on the OEBP.
Right-sorted BPs have the keyword "right-null" on the OEBP.
See BP796 for the version with pictures of Bongard Problems (miniproblems) instead of links to pages on the OEBP.
See BP1160 for the version about an all-black panel instead of all-white.
Adjacent-numbered pages: BP562 BP563 BP564 BP565 BP566  *  BP568 BP569 BP570 BP571 BP572
meta (see left/right), links, keyword, side, wellfounded, testexample
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Aaron David Fairbanks
Note that most traditional Bongard Problems don't sort an all black-panel at all.
See BP567 (left-null versus right-null) for the version about all-white panels, which is more often applicable.
Adjacent-numbered pages: BP1155 BP1156 BP1157 BP1158 BP1159  *  BP1161 BP1162 BP1163 BP1164 BP1165
meta (see left/right), links, side, testexample
Leo Crabbe