The On-Line Encyclopedia of Bongard Problems

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Circle falls by gravity on the right of all other objects if let loose vs. circle falls by gravity on the left of all other objects if let loose.

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	CROSSREFS	`Adjacent-numbered pages: BP229 BP230 BP231 BP232 BP233 * BP235 BP236 BP237 BP238 BP239`
	KEYWORD	`dual, handed, leftright, physics, orderedtriplet, traditional`
	CONCEPT	`bounding_box (info \| search),` `downward_upward (info \| search),` `left_right (info \| search),` `line_absolute_direction (info \| search),` `absolute_direction (info \| search),` `imagined_motion (info \| search),` `motion (info \| search),` `direction (info \| search),` `gravity (info \| search)`
	AUTHOR	`Peter Shanahan`

BP278

Shorter on the left, taller on the right vs. taller on the left, shorter on the right.

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	CROSSREFS	`Adjacent-numbered pages: BP273 BP274 BP275 BP276 BP277 * BP279 BP280 BP281 BP282 BP283`
	KEYWORD	`dual, handed, leftright`
	CONCEPT	`size_increase_decrease (info \| search),` `convex_hull (info \| search),` `leftward_rightward (info \| search),` `regular_irregular_change (info \| search),` `tracing_line_or_curve (info \| search)`
	WORLD	`arial_font_two_symbols [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

BP279

The left part has more pixels (area) than the right part vs. the left part has fewer pixels than the right part.

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	CROSSREFS	`Adjacent-numbered pages: BP274 BP275 BP276 BP277 BP278 * BP280 BP281 BP282 BP283 BP284`
	KEYWORD	`dual, handed, leftright, pixelperfect`
	CONCEPT	`left_right (info \| search),` `length_line_or_curve (info \| search),` `area (info \| search)`
	WORLD	`arial_font_two_symbols [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

BP286

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"`

BP313

Closed curves clockwise, open curves counterclockwise vs. closed curves counterclockwise, open curves clockwise.

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	CROSSREFS	`Adjacent-numbered pages: BP308 BP309 BP310 BP311 BP312 * BP314 BP315 BP316 BP317 BP318`
	KEYWORD	`dual, handed, leftright, updown, traditional`
	CONCEPT	`turn_orientation (info \| search),` `closed_open (info \| search)`
	AUTHOR	`Jakub Štepo`

BP337

Black is below upward slopes vs. black is below downward slopes.

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	CROSSREFS	`Adjacent-numbered pages: BP332 BP333 BP334 BP335 BP336 * BP338 BP339 BP340 BP341 BP342`
	KEYWORD	`nice, dual, handed, leftright, updown, blackwhite, traditional`
	CONCEPT	`above_below (info \| search),` `downward_upward (info \| search),` `outlined_filled (info \| search),` `texture (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP357

Decelerating change in quantity, left-to-right vs. accelerating change in quantity, left-to-right.

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	CROSSREFS	`Adjacent-numbered pages: BP352 BP353 BP354 BP355 BP356 * BP358 BP359 BP360 BP361 BP362`
	KEYWORD	`dual, leftright, creativeexamples, structure, traditional, rules, miniworlds`
	CONCEPT	`acceleration (info \| search),` `size_increase_decrease (info \| search),` `tracing_line_or_curve (info \| search)`
	WORLD	`quantity_change_seq_increase_right [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP363

Counterclockwise along the curve following the arrow vs. clockwise along the curve following the arrow.

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	CROSSREFS	`Adjacent-numbered pages: BP358 BP359 BP360 BP361 BP362 * BP364 BP365 BP366 BP367 BP368`
	KEYWORD	`easy, nice, dual, handed, leftright, updown, gap, traditional`
	CONCEPT	`arrow (info \| search),` `turn_orientation (info \| search),` `tracing_line_or_curve (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP372

Shape below fits on the left vs. shape below fits on the right.

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	COMMENTS	`See BP805 for the version of this with box-based BPs.`
	CROSSREFS	`Adjacent-numbered pages: BP367 BP368 BP369 BP370 BP371 * BP373 BP374 BP375 BP376 BP377`
	KEYWORD	`nice, dual, handed, leftright, creativeexamples, structure, traditional, rules`
	CONCEPT	`bongard_problem (info \| search),` `categorization (info \| search),` `feature_cluster (info \| search),` `cluster (info \| search),` `choice (info \| search)`
	WORLD	`bdimage_shapes_extra_below_clear_sort [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP513

Bongard Problems whose left examples could stand alone vs. the right side is necessary to communicate what the left side is.

BP1	BP31	BP50	BP328	BP334	BP345
BP356	BP373	BP384	BP386	BP559	BP569
BP850	BP856	BP902	BP922	BP932	BP935
BP937	BP988	BP989	BP999	BP1004	BP1005
BP1006	BP1011	BP1049	BP1080	BP1086	BP1093
BP1098	BP1109	BP1110	BP1145	BP1147	. . .

?
BP544

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

	COMMENTS	`Left-sorted Bongard Problems have the the keyword "left-narrow" on the OEBP.` `Call a rule "narrow" if it is likely to be noticed in a large collection of examples, without any counterexamples provided.` `A collection of triangles will be recognized as such; "triangles" is a narrow rule. A collection of non-triangular shapes will just be seen as "shapes"; "not triangles" is not narrow.` `Intuitively, a narrow rule seems small in comparison to the space of other related possibilities. Narrow rules tend to be phrased positively ("is [property]"), while non-narrow rules opposite narrow rules tend to be phrased negatively ("is not [property]").` `Both sides of a Bongard Problem can be narrow, e.g. BP6.` `Even a rule and its conceptual opposite can be narrow, e.g. BP20.` `A Bongard Problem such that one side is narrow and the other side is the non-narrow opposite reads as the narrow side being a subset of the other. See BP881.` `What seems like a typical example depends on expectations. (See the keyword assumesfamiliarity for Bongard Problems that require the solver to go in with special expectations.)` `A person might notice the absence of triangles in a collection of just polygons, because a triangle is such a typical example of a polygon. On the other hand, a person will probably not notice the absence of 174-gons in a collection of polygons.` `Typically, any example fitting a narrow rule can be changed slightly to no longer fit. (This is not always the case, however. Consider the narrow rule "is approximately a triangle".) See the keyword stable.` `It is possible for a rule to be "narrow" (communicable by a properly chosen collection of examples) but not clearly communicated by a particular collection of examples satisfying it, e.g., a collection of examples that is too small to communicate it.` `Note that this is not just BP514 (right-narrow) flipped.` `Is it possible for a rule to be such that some collections of examples do bring it to mind, but no collection of examples unambiguously communicates it as the intended rule? Perhaps there is some border case the rule excludes, but it is not clear whether the border case was intentionally left out. The border case's absence would likely become more conspicuous with more examples (assuming the collection of examples naturally brings this border case to mind).`
	CROSSREFS	`See BP830 for a version with pictures of Bongard Problems (miniproblems) instead of links.` `Adjacent-numbered pages: BP508 BP509 BP510 BP511 BP512 * BP514 BP515 BP516 BP517 BP518`
	KEYWORD	`dual, meta (see left/right), links, keyword, side`
	WORLD	`bp [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

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