Represented are Bongard Problems and an extra object to sort, a.k.a. the Bongard's Dozen format.
A variety of kinds of ambiguities showcased as left examples.
Adjacent-numbered pages: BP850 BP851 BP852 BP853 BP854  *  BP856 BP857 BP858 BP859 BP860
nice, creativeexamples, structure, rules
bdimage_shapes_extra_below [smaller | same | bigger] zoom in right (bdimage_shapes_extra_below_clear_sort)
Aaron David Fairbanks