The On-Line Encyclopedia of Bongard Problems

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No axis of symmetry vs. vertical axis of symmetry.

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	CROSSREFS	`BP50 is the same solution (with the sides switched), using multiple shapes and with some shapes filled in black.` `BP1206 is like BP50 but instead of "no axis of symmetry at all" it uses "no vertical axis of symmetry".` `Adjacent-numbered pages: BP147 BP148 BP149 BP150 BP151 * BP153 BP154 BP155 BP156 BP157`
	KEYWORD	`rotate, stretch, traditional`
	CONCEPT	`existence (info \| search),` `symmetry_axis (info \| search),` `symmetry (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Predominance of curves and hook-like endings vs. predominance of straight lines and staple-like endings.

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	CROSSREFS	`Adjacent-numbered pages: BP148 BP149 BP150 BP151 BP152 * BP154 BP155 BP156 BP157 BP158`
	KEYWORD	`traditional`
	CONCEPT	`line_or_curve_endpoint (info \| search),` `specific_style (info \| search),` `specificity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Wedged endings vs. rounded endings.

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	CROSSREFS	`Adjacent-numbered pages: BP149 BP150 BP151 BP152 BP153 * BP155 BP156 BP157 BP158 BP159`
	KEYWORD	`traditional`
	CONCEPT	`curved_straight (info \| search),` `line_or_curve_endpoint (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `specific_style (info \| search),` `specificity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Curves are longer than straight lines vs. curves are shorter than straight lines.

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	CROSSREFS	`Adjacent-numbered pages: BP150 BP151 BP152 BP153 BP154 * BP156 BP157 BP158 BP159 BP160`
	KEYWORD	`traditional`
	CONCEPT	`curved_straight (info \| search),` `length_line_or_curve (info \| search),` `specific_style (info \| search),` `specificity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Three spatially separated clusters vs. two spatially separated clusters.

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	CROSSREFS	`Adjacent-numbered pages: BP151 BP152 BP153 BP154 BP155 * BP157 BP158 BP159 BP160 BP161`
	KEYWORD	`traditional`
	CONCEPT	`number (info \| search),` `feature_cluster (info \| search),` `cluster_of_one (info \| search),` `cluster (info \| search),` `two (info \| search),` `three (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

White background vs. black background.

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	CROSSREFS	`Adjacent-numbered pages: BP152 BP153 BP154 BP155 BP156 * BP158 BP159 BP160 BP161 BP162`
	KEYWORD	`dual, boundingbox, blackwhite, traditional, bordercontent`
	CONCEPT	`background (info \| search),` `bounding_box (info \| search),` `outlined_filled (info \| search),` `texture (info \| search)`
	WORLD	`zoom in left (curves_and_fill_shapes_drawing)`
	AUTHOR	`Harry E. Foundalis`

Some slope vs. another slope.

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	CROSSREFS	`Adjacent-numbered pages: BP153 BP154 BP155 BP156 BP157 * BP159 BP160 BP161 BP162 BP163`
	KEYWORD	`dual, arbitrary, rotate, traditional`
	CONCEPT	`line_slope (info \| search),` `specific_value (info \| search),` `specificity (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Quadrilateral that is nearly a triangle vs. typical quadrilateral.

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	CROSSREFS	`Adjacent-numbered pages: BP155 BP156 BP157 BP158 BP159 * BP161 BP162 BP163 BP164 BP165`
	KEYWORD	`perfect, traditional`
	CONCEPT	`imperfection_small (info \| search),` `number (info \| search),` `triangle (info \| search)`
	WORLD	`Multiple options: [smaller \| same \| bigger], quadrilateral_outline [smaller \| same \| bigger]`
	AUTHOR	`Harry E. Foundalis`

Midpoints are collinear vs. midpoints are not collinear.

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	CROSSREFS	`Adjacent-numbered pages: BP156 BP157 BP158 BP159 BP160 * BP162 BP163 BP164 BP165 BP166`
	KEYWORD	`nice, unorderedtriplet, traditional`
	CONCEPT	`all (info \| search),` `collinear (info \| search),` `midpoint (info \| search),` `imagined_point (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Every other side, if extended, passes through one point vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP157 BP158 BP159 BP160 BP161 * BP163 BP164 BP165 BP166 BP167`
	KEYWORD	`hard, noisy, traditional`
	CONCEPT	`lines_coincide (info \| search),` `every_other (info \| search),` `imagined_point (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Harry E. Foundalis`

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