The On-Line Encyclopedia of Bongard Problems

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Image contains the exact arrangement of pixels that form the "S" creature depicted in EX9532 vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP1156 BP1157 BP1158 BP1159 BP1160 * BP1162 BP1163 BP1164 BP1165 BP1166`
	KEYWORD	`unwordable, notso, arbitrary, handed, leftright, updown, stretch, blackwhite, creativeexamples, right-null, perfect, pixelperfect, help`
	AUTHOR	`Leo Crabbe`

BP1181

Unordered object-wise comparison Bongard Problems where the number of objects can vary between examples vs. similar Bongard Problems where certain objects are distinguishable in some consistent way across all examples.

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	COMMENTS	`Any "sequence" (BP929^left) or "grid" (BP1176^left) Problems will be sorted right.`
	CROSSREFS	`Adjacent-numbered pages: BP1176 BP1177 BP1178 BP1179 BP1180 * BP1182 BP1183 BP1184 BP1185 BP1186`
	KEYWORD	`unwordable, meta (see left/right), links`
	WORLD	`[smaller \| same \| bigger]`
	AUTHOR	`Leo Crabbe`

BP1242

Tiled by pair of fractals including itself such that both tile the other vs. tiled by pair of fractals including itself such that the other tiles itself.

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	COMMENTS	`Proofs still needed that all the examples on the left hand side cannot fit on the right hand side as well, and that EX9881 cannot fit on the left hand side as well.`
	CROSSREFS	`The left hand side implies the left hand side of BP1116.` `The right hand side does not imply the right hand side of BP1116. (EX9881 is meant to be a counterexample.)` `Adjacent-numbered pages: BP1237 BP1238 BP1239 BP1240 BP1241 * BP1243 BP1244 BP1245 BP1246 BP1247`
	KEYWORD	`unwordable, overriddensolution, perfect, infinitedetail, both, missingproofs`
	CONCEPT	`fractal (info \| search),` `recursion (info \| search),` `self-reference (info \| search),` `tiling (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP1246

Any symmetry exhibited by some non-empty subset of the objects is also a symmetry of the whole thing vs. not so.

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	COMMENTS	`In other words, placing the image over itself (rotation and flipping allowed) so that any parts match up makes the whole image match up to itself vs. not so.`
	CROSSREFS	`See BP965 for a variation on this idea where the "parts" are allowed to be arbitrary regions of the image instead of individual objects shown in the image.` `Adjacent-numbered pages: BP1241 BP1242 BP1243 BP1244 BP1245 * BP1247 BP1248 BP1249 BP1250 BP1251`
	KEYWORD	`precise, allsorted, unwordable, notso, traditional`
	CONCEPT	`self-reference (info \| search),` `symmetry (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP1247

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.

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	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.

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	CROSSREFS	`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`

BP1250

BPs whose left-sorted examples exhibit the following property: if a square region of any left-sorted example is replaced with any other left-sorted example, the resultant image is also sorted left vs. BPs whose left-sorted examples do not exhibit this property.

BP1

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	CROSSREFS	`Adjacent-numbered pages: BP1245 BP1246 BP1247 BP1248 BP1249 * BP1251 BP1252 BP1253 BP1254`
	KEYWORD	`unwordable, meta (see left/right), links`
	AUTHOR	`Leo Crabbe`

BP1251

BPs whose right-sorted examples exhibit the following property: if a square region of any right-sorted example is replaced with any other right-sorted example, the resultant image is also sorted right vs. BPs whose right-sorted examples do not exhibit this property.

BP1

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	CROSSREFS	`Adjacent-numbered pages: BP1246 BP1247 BP1248 BP1249 BP1250 * BP1252 BP1253 BP1254`
	KEYWORD	`unwordable, meta (see left/right), links`
	AUTHOR	`Leo Crabbe`

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