Left-sorted Bongard Problems have the keyword "projectionmatters" on the OEBP.
Right-sorted Bongard Problems have the keyword "3d" on the OEBP.
See BP895 (presentationmatters vs. presentationinvariant) for a similar idea: there Bongard Problems are to Bongard Problem solutions as here 2D representations are to 3D objects.
Adjacent-numbered pages: BP1005 BP1006 BP1007 BP1008 BP1009  *  BP1011 BP1012 BP1013 BP1014 BP1015
meta (see left/right), links, keyword, sideless, dependence
Leo Crabbe