The On-Line Encyclopedia of Bongard Problems

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Upper central line APPEARS shorter than lower central line vs. upper central line APPEARS longer than lower central line.

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	CROSSREFS	`Adjacent-numbered pages: BP232 BP233 BP234 BP235 BP236 * BP238 BP239 BP240 BP241 BP242`
	KEYWORD	`less, anticomputer, subjective, culture, invalid, traditional`
	CONCEPT	`length_line_or_curve (info \| search),` `visual_illusion (info \| search)`
	AUTHOR	`Peter Shanahan`

Large and medium-sized square, the latter can be hidden vs. large and small-sized square, the latter can be hidden.

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	CROSSREFS	`Adjacent-numbered pages: BP296 BP297 BP298 BP299 BP300 * BP302 BP303 BP304 BP305 BP306`
	KEYWORD	`invalid, traditional`
	CONCEPT	`outlined_filled (info \| search),` `size (info \| search),` `objects_overlap (info \| search),` `overlap (info \| search),` `texture (info \| search)`
	AUTHOR	`"Lewis"`

Shown is a box of this Bongard Problem (BP538) vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP533 BP534 BP535 BP536 BP537 * BP539 BP540 BP541 BP542 BP543`
	KEYWORD	`less, notso, left-finite, finished, invalid, experimental, funny`
	CONCEPT	`recursion (info \| search),` `self-reference (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

Solution for this problem (BP545) in English text vs. not.

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	COMMENTS	`This Problem admits multiple solutions besides "Solution for this problem in English text vs. not so," some of which are listed as the left examples. Some do not depend on the English language, so this Problem is technically "solvable" without the relevant cultural information.`
	CROSSREFS	`Adjacent-numbered pages: BP540 BP541 BP542 BP543 BP544 * BP546 BP547 BP548 BP549 BP550`
	KEYWORD	`less, notso, culture, finished, invalid, experimental, funny`
	CONCEPT	`recursion (info \| search),` `self-reference (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

Aesthetically pleasing vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP807 BP808 BP809 BP810 BP811 * BP813 BP814 BP815 BP816 BP817`
	KEYWORD	`easy, fuzzy, abstract, notso, stretch, anticomputer, subjective, invalid, experimental, funny, dithering`
	AUTHOR	`Aaron David Fairbanks`

Vaguely positive vs. vaguely negative

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	COMMENTS	`Requires cultural knowledge, e.g. for specific warning symbols`
	CROSSREFS	`Adjacent-numbered pages: BP877 BP878 BP879 BP880 BP881 * BP883 BP884 BP885 BP886 BP887`
	KEYWORD	`easy, less, abstract, spectrum, anticomputer, subjective, culture, invalid`
	AUTHOR	`Thomas Joyce`

Optical illusions vs. not so.

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	COMMENTS	`Panels on the left hand side contain geometrical objects that appear distorted (to a human) due to surrounding information.`
	REFERENCE	`Vicente Sierra-Vázquez & Ignacio Serrano-Pedraza, Application of Riesz transforms to the isotropic AM-PM decomposition of geometrical-optical illusion images, April 2010, Figure 1.`
	CROSSREFS	`Adjacent-numbered pages: BP934 BP935 BP936 BP937 BP938 * BP940 BP941 BP942 BP943 BP944`
	KEYWORD	`fuzzy, anticomputer, subjective, contributepairs, invalid, experimental`
	CONCEPT	`length_line_or_curve (info \| search),` `visual_illusion (info \| search)`
	AUTHOR	`Leo Crabbe`

JPEG image vs. PNG image.

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	COMMENTS	`Evidently this solution is stretching the idea of what makes images "different". Each corresponding pair of panels would be parsed as identical in any other case. It is worth noting that if you view this Problem on a template, the solution no longer applies at all.`
	CROSSREFS	`Adjacent-numbered pages: BP936 BP937 BP938 BP939 BP940 * BP942 BP943 BP944 BP945 BP946`
	KEYWORD	`less, precise, dual, antihuman, contributepairs, invalid, experimental, funny`
	AUTHOR	`Leo Crabbe`

Square bounding box vs. oblong rectangular bounding box.

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	CROSSREFS	`Adjacent-numbered pages: BP937 BP938 BP939 BP940 BP941 * BP943 BP944 BP945 BP946 BP947`
	KEYWORD	`precise, stretch, boundingbox, invalid, experimental, preciseworld`
	CONCEPT	`bounding_box (info \| search),` `square (info \| search)`
	WORLD	`rectangular_arrangement_of_white_pixels [smaller \| same \| bigger] zoom in left (square_arrangement_of_white_pixels) \| zoom in right (oblong_rectangular_arrangement_of_white_pixels)`
	AUTHOR	`Leo Crabbe`

Blank image vs. nothing.

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	COMMENTS	`Two kinds of "nothing".`
	CROSSREFS	`See also BP1219, "blank image vs. image of blank square".` `Adjacent-numbered pages: BP1051 BP1052 BP1053 BP1054 BP1055 * BP1057 BP1058 BP1059 BP1060 BP1061`
	KEYWORD	`left-finite, right-finite, left-full, right-full, left-null, finished, invalid, experimental, funny, finishedexamples`
	CONCEPT	`empty (info \| search),` `existence (info \| search),` `zero (info \| search)`
	WORLD	`blank_image [smaller \| same \| bigger] zoom in left (blank_image) \| zoom in right (nothing)`
	AUTHOR	`Aaron David Fairbanks`

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