The On-Line Encyclopedia of Bongard Problems

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If any non-nosed faces exist, they are happy if and only if happy nosed faces exist as well vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP285 BP286 BP287 BP288 BP289 * BP291 BP292 BP293 BP294 BP295`
	KEYWORD	`convoluted`
	CONCEPT	`existence (info \| search),` `iff (info \| search)`
	AUTHOR	`"Lewis"`

Shapes, if tiled up properly, form a square vs. shapes cannot form a square no matter how they are tiled.

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	CROSSREFS	`Adjacent-numbered pages: BP284 BP285 BP286 BP287 BP288 * BP290 BP291 BP292 BP293 BP294`
	KEYWORD	`nice, stretch, traditional`
	CONCEPT	`square (info \| search),` `tiling (info \| search)`
	AUTHOR	`"Lewis"`

The sum of the ratios of the filled areas is 1 vs. the sum of the ratios of the filled areas is other than 1.

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	CROSSREFS	`Adjacent-numbered pages: BP283 BP284 BP285 BP286 BP287 * BP289 BP290 BP291 BP292 BP293`
	KEYWORD	`nice, notso, traditional`
	CONCEPT	`addition (info \| search),` `outlined_filled (info \| search),` `ratio (info \| search),` `texture (info \| search)`
	AUTHOR	`"Lewis"`

Rays emanating from a central point vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP282 BP283 BP284 BP285 BP286 * BP288 BP289 BP290 BP291 BP292`
	KEYWORD	`traditional`
	CONCEPT	`lines_coincide (info \| search),` `imagined_point (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `triangle_arrow (info \| search),` `triangle (info \| search)`
	AUTHOR	`"Lewis"`

Decreasing in size from top to bottom vs. increasing in size from top to bottom.

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	CROSSREFS	`Adjacent-numbered pages: BP281 BP282 BP283 BP284 BP285 * BP287 BP288 BP289 BP290 BP291`
	KEYWORD	`dual, handed, updown, traditional`
	CONCEPT	`size_increase_decrease (info \| search),` `downward_upward (info \| search),` `regular_irregular_change (info \| search),` `size (info \| search)`
	AUTHOR	`"Lewis"`

The centers (barycenters) of the objects are collinear vs. the centers (barycenters) of the objects are not collinear.

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	CROSSREFS	`Adjacent-numbered pages: BP280 BP281 BP282 BP283 BP284 * BP286 BP287 BP288 BP289 BP290`
	KEYWORD	`traditional, finishedexamples`
	CONCEPT	`collinear (info \| search)`
	AUTHOR	`"Lewis"`

Half of the square is filled vs. either more or less than half of the square is filled.

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	CROSSREFS	`Adjacent-numbered pages: BP279 BP280 BP281 BP282 BP283 * BP285 BP286 BP287 BP288 BP289`
	KEYWORD	`nice, traditional`
	CONCEPT	`half (info \| search),` `outlined_filled (info \| search),` `texture (info \| search)`
	AUTHOR	`"Lewis"`

Rectangle left after tiling all black shapes into empty square vs. triangle left after tiling all black shapes into empty square.

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	CROSSREFS	`Adjacent-numbered pages: BP278 BP279 BP280 BP281 BP282 * BP284 BP285 BP286 BP287 BP288`
	KEYWORD	`traditional`
	CONCEPT	`outlined_filled (info \| search),` `tiling (info \| search),` `texture (info \| search),` `triangle (info \| search)`
	AUTHOR	`Sang-Joon Yoon`

Shape of black region has as many sides as overall object vs. shape of black region has different number of sides than overall object.

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	CROSSREFS	`Adjacent-numbered pages: BP277 BP278 BP279 BP280 BP281 * BP283 BP284 BP285 BP286 BP287`
	KEYWORD	`traditional`
	CONCEPT	`outlined_filled (info \| search),` `similar_shape (info \| search),` `similar (info \| search),` `texture (info \| search)`
	AUTHOR	`Sang-Joon Yoon`

Equal number of horizontal and vertical lines vs. unequal number of horizontal and vertical lines.

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	CROSSREFS	`Adjacent-numbered pages: BP276 BP277 BP278 BP279 BP280 * BP282 BP283 BP284 BP285 BP286`
	KEYWORD	`traditional`
	CONCEPT	`horizontal (info \| search),` `number (info \| search),` `same_number (info \| search),` `same (info \| search),` `vertical (info \| search)`
	WORLD	`segments_cross [smaller \| same \| bigger]`
	AUTHOR	`Sang-Joon Yoon`

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