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BP18 "Pinched" shape (drastically thinner somewhere in the middle than on the ends) vs. non-pinched shape.
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COMMENTS

All examples in this Bongard Problem are oblong outlines of shapes.

REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 219.

CROSSREFS

Adjacent-numbered pages:
BP13 BP14 BP15 BP16 BP17  *  BP19 BP20 BP21 BP22 BP23

KEYWORD

finished, traditional, bongard

CONCEPT neck_narrowing (info | search)

WORLD

elongated_outline [smaller | same | bigger]

AUTHOR

Mikhail M. Bongard

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