The On-Line Encyclopedia of Bongard Problems

"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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