All small squares appearing in this problem are axis-aligned.
M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 221.
Adjacent-numbered pages: BP19 BP20 BP21 BP22 BP23  *  BP25 BP26 BP27 BP28 BP29
finished, traditional, bongard
circle_square_eq-tri_small_outlines [smaller | same | bigger]
Mikhail M. Bongard
Adjacent-numbered pages: BP849 BP850 BP851 BP852 BP853  *  BP855 BP856 BP857 BP858 BP859
left-finite, right-finite, left-full, right-full, finished, experimental, funny
nothing [same | bigger]zoom in left (nothing) | zoom in right (nothing)
Aaron David Fairbanks