The On-Line Encyclopedia of Bongard Problems

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No straight path from one side of the panel to the other passes through the grey shape without hitting a black region vs. such a path exists.

(edit; present; nest [left/right]; search; history)

	REFERENCE	`https://en.wikipedia.org/wiki/Opaque_set`
	CROSSREFS	`Adjacent-numbered pages: BP1242 BP1243 BP1244 BP1245 BP1246 * BP1248 BP1249 BP1250 BP1251 BP1252`
	KEYWORD	`precise, allsorted, unwordable, notso`
	CONCEPT	`imagined_line_or_curve (info \| search)`
	WORLD	`[smaller \| same \| bigger] zoom in left`
	AUTHOR	`Leo Crabbe`

BP1248

No straight path passes from a white region to a grey one, then to white again (without hitting black) vs. such a path exists.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Any small amount of convexity along the grey border will cause an example to fit right.` `Adjacent-numbered pages: BP1243 BP1244 BP1245 BP1246 BP1247 * BP1249 BP1250 BP1251 BP1252 BP1253`
	KEYWORD	`precise, allsorted, unwordable, notso, perfect`
	CONCEPT	`imagined_line_or_curve (info \| search)`
	WORLD	`[smaller \| same \| bigger] zoom in left`
	AUTHOR	`Leo Crabbe`

BP1249

Any straight path will hit a black region vs. not so.

(edit; present; nest [left/right]; search; history)

	REFERENCE	`https://en.wikipedia.org/wiki/Opaque_set`
	CROSSREFS	`Adjacent-numbered pages: BP1244 BP1245 BP1246 BP1247 BP1248 * BP1250 BP1251 BP1252 BP1253 BP1254`
	KEYWORD	`notso, blackwhite, right-null, perfect, bordercontent`
	CONCEPT	`imagined_line_or_curve (info \| search)`
	AUTHOR	`Leo Crabbe`

BP1252

No entirely white paths from one side to another vs. one can find such a path.

(edit; present; nest [left/right]; search; history)

	COMMENTS	`The left-sorted patterns connect all four corners with a single black region. - Rhodri Prysor, Oct 16 2024`
	CROSSREFS	`Adjacent-numbered pages: BP1247 BP1248 BP1249 BP1250 BP1251 * BP1253 BP1254 BP1255 BP1256 BP1257`
	KEYWORD	`precise, allsorted, notso, blackwhite, right-null, bordercontent`
	AUTHOR	`Leo Crabbe`

BP1253

Text strings vs. images of text strings

WWWWWWW

____hem

image

joym

жю

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP1248 BP1249 BP1250 BP1251 BP1252 * BP1254 BP1255 BP1256 BP1257 BP1258`
	KEYWORD	`gap, experimental`
	AUTHOR	`Leo Crabbe`

BP1255

Shades of green vs. shades of red.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP1250 BP1251 BP1252 BP1253 BP1254 * BP1256 BP1257 BP1258 BP1259 BP1260`
	KEYWORD	`easy, precise, allsorted, minimal, arbitrary, color, continuous`
	AUTHOR	`Leo Crabbe`

BP1256

Arrows which if moved at speeds proportional to their length would pass eachother vs. not so

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP1251 BP1252 BP1253 BP1254 BP1255 * BP1257 BP1258 BP1259 BP1260 BP1261`
	KEYWORD	`precise, physics, unorderedpair, traditional`
	CONCEPT	`arrow (info \| search)`
	AUTHOR	`Matt Samuels`

BP1257

The rule is about squares having a certain relationship with their neighbors vs. it is not.

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	COMMENTS	`"Local vs. global."` `For clarity, rules involving diagonal neighbors or squares more than one step away are never used.` `The similar solution "Each square can be deduced from its neighbors vs. not so" does not quite work; for example EX8114 would then not fit left. See also BP1258 ("Each square can be deduced from the rest vs. not so").`
	CROSSREFS	`Adjacent-numbered pages: BP1252 BP1253 BP1254 BP1255 BP1256 * BP1258 BP1259 BP1260 BP1261 BP1262`
	KEYWORD	`structure, rules, grid, miniworlds`
	CONCEPT	`local_global (info \| search)`
	WORLD	`grid_of_images_with_rule [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP1258

It is possible to deduce the contents of any square from the rest vs. it is not.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`BP979 is very similar: whether a particular square can be deduced from the rest.` `Adjacent-numbered pages: BP1253 BP1254 BP1255 BP1256 BP1257 * BP1259 BP1260 BP1261 BP1262 BP1263`
	KEYWORD	`notso, rules, grid, miniworlds`
	CONCEPT	`convey_enough_information (info \| search),` `choice (info \| search)`
	WORLD	`grid_of_images_with_rule [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP1259

Rule is the same for rows as it is for columns vs. not

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`All examples on the left are chosen so that rotating or flipping the grid in any way would result in a grid satisfying the same rule.` `Adjacent-numbered pages: BP1254 BP1255 BP1256 BP1257 BP1258 * BP1260 BP1261 BP1262 BP1263 BP1264`
	KEYWORD	`notso, rules, grid, miniworlds`
	WORLD	`grid_of_images_with_rule [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

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