The On-Line Encyclopedia of Bongard Problems

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BP17

Shape with a reflex corner vs. shape without a reflex corner.

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	COMMENTS	`All examples in this Bongard Problem are outlines of shapes.`
	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 219.`
	CROSSREFS	`Adjacent-numbered pages: BP12 BP13 BP14 BP15 BP16 * BP18 BP19 BP20 BP21 BP22`
	KEYWORD	`finished, traditional, bongard`
	CONCEPT	`acute (info \| search),` `angle (info \| search),` `indentation (info \| search)`
	WORLD	`shape_outline [smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

BP55

A circle is at the left of the cavity if you look from inside the figure vs. a circle is at the right of the cavity if you look from inside the figure.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 232.`
	CROSSREFS	`Adjacent-numbered pages: BP50 BP51 BP52 BP53 BP54 * BP56 BP57 BP58 BP59 BP60`
	KEYWORD	`dual, handed, finished, traditional, bongard`
	CONCEPT	`indentation (info \| search),` `on_line_or_curve (info \| search),` `separation_of_joined_objects (info \| search),` `tracing_line_or_curve (info \| search),` `rotational_direction (info \| search),` `direction (info \| search)`
	AUTHOR	`Mikhail M. Bongard`

BP76

Long sides concave vs. long sides convex.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 239.`
	CROSSREFS	`Adjacent-numbered pages: BP71 BP72 BP73 BP74 BP75 * BP77 BP78 BP79 BP80 BP81`
	KEYWORD	`nice, stretch, finished, traditional, viceversa, bongard`
	CONCEPT	`indentation (info \| search),` `size (info \| search)`
	WORLD	`[smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

BP91

Three identical elements vs. four identical elements.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 244.`
	CROSSREFS	`BP1226 is "three identical elements vs. other number of identical elements".` `Adjacent-numbered pages: BP86 BP87 BP88 BP89 BP90 * BP92 BP93 BP94 BP95 BP96`
	KEYWORD	`number, ignoreimperfections, finished, traditional, bongard`
	CONCEPT	`indentation (info \| search),` `on_line_or_curve (info \| search),` `number (info \| search),` `protrusion (info \| search),` `separation_of_joined_objects (info \| search),` `same (info \| search),` `three (info \| search),` `four (info \| search)`
	WORLD	`curves_and_fill_shapes_drawing [smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

BP101

Parallel dents vs. perpendicular dents.

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	CROSSREFS	`Adjacent-numbered pages: BP96 BP97 BP98 BP99 BP100 * BP102 BP103 BP104 BP105 BP106`
	KEYWORD	`traditional`
	CONCEPT	`indentation (info \| search),` `imagined_shape (info \| search),` `imagined_entity (info \| search),` `parallel (info \| search),` `perpendicular (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

BP125

One protrusion and one indentation of the same shape vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP120 BP121 BP122 BP123 BP124 * BP126 BP127 BP128 BP129 BP130`
	KEYWORD	`traditional`
	CONCEPT	`indentation (info \| search),` `protrusion (info \| search),` `same_shape (info \| search),` `same (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

BP129

Indentation on protrusion vs. indentation on indentation.

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	CROSSREFS	`Adjacent-numbered pages: BP124 BP125 BP126 BP127 BP128 * BP130 BP131 BP132 BP133 BP134`
	KEYWORD	`traditional`
	CONCEPT	`indentation (info \| search),` `protrusion (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

BP175

Small object can glide in the bay vs. small object cannot glide in the bay.

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	CROSSREFS	`Adjacent-numbered pages: BP170 BP171 BP172 BP173 BP174 * BP176 BP177 BP178 BP179 BP180`
	KEYWORD	`orderedpair, traditional`
	CONCEPT	`entrance_exit (info \| search),` `indentation (info \| search),` `rotation_required (info \| search),` `imagined_motion (info \| search),` `motion (info \| search),` `specific_shape (info \| search),` `physically_fitting (info \| search)`
	AUTHOR	`Harry E. Foundalis`

BP181

One concavity vs. two concavities.

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	CROSSREFS	`Adjacent-numbered pages: BP176 BP177 BP178 BP179 BP180 * BP182 BP183 BP184 BP185 BP186`
	KEYWORD	`noisy, traditional`
	CONCEPT	`indentation (info \| search),` `number (info \| search),` `one (info \| search),` `two (info \| search)`
	AUTHOR	`Harry E. Foundalis`

BP231

Five concavities vs. not five concavities.

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	CROSSREFS	`Adjacent-numbered pages: BP226 BP227 BP228 BP229 BP230 * BP232 BP233 BP234 BP235 BP236`
	KEYWORD	`less, noisy, arbitrary, traditional`
	CONCEPT	`indentation (info \| search),` `number (info \| search),` `five (info \| search)`
	AUTHOR	`Giuseppe Insana`

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