The On-Line Encyclopedia of Bongard Problems

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Parallel dents vs. perpendicular dents.

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	CROSSREFS	`Adjacent-numbered pages: BP96 BP97 BP98 BP99 BP100 * BP102 BP103 BP104 BP105 BP106`
	KEYWORD	`traditional`
	CONCEPT	`indentation (info \| search),` `imagined_shape (info \| search),` `imagined_entity (info \| search),` `parallel (info \| search),` `perpendicular (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Internal arrows point outward vs. internal arrows point inward.

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	CROSSREFS	`Adjacent-numbered pages: BP97 BP98 BP99 BP100 BP101 * BP103 BP104 BP105 BP106 BP107`
	KEYWORD	`traditional`
	CONCEPT	`arrow (info \| search),` `between (info \| search),` `tracing_lines_or_curves_meet (info \| search),` `tracing_line_or_curve (info \| search),` `imagined_point (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Isosceles triangle vs. scalene triangle.

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	CROSSREFS	`Adjacent-numbered pages: BP98 BP99 BP100 BP101 BP102 * BP104 BP105 BP106 BP107 BP108`
	KEYWORD	`precise, allsorted, stretch, orderedpair, traditional, preciseworld`
	CONCEPT	`line_or_curve_endpoint (info \| search),` `length_line_or_curve (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `same_feature (info \| search),` `same (info \| search),` `isosceles_triangle (info \| search),` `triangle (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

One circle passes through the center of the other circle vs. no circle passes through the center of the other circle.

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	CROSSREFS	`Adjacent-numbered pages: BP99 BP100 BP101 BP102 BP103 * BP105 BP106 BP107 BP108 BP109`
	KEYWORD	`precise, unorderedpair, traditional`
	CONCEPT	`on_line_or_curve (info \| search),` `center_of_circle (info \| search),` `center (info \| search),` `imagined_point (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Ends of line point to the same direction vs. ends of line do not point to the same direction.

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	CROSSREFS	`Adjacent-numbered pages: BP100 BP101 BP102 BP103 BP104 * BP106 BP107 BP108 BP109 BP110`
	KEYWORD	`noisy, traditional`
	CONCEPT	`slope_at_endpoint (info \| search),` `tracing_line_or_curve (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Negative slope vs. positive slope.

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	COMMENTS	`All examples feature a white circle and a black circle. The answer refers to the slope of the line connecting the two circles.` `The coloring of the circles is irrelevant.`
	CROSSREFS	`Adjacent-numbered pages: BP101 BP102 BP103 BP104 BP105 * BP107 BP108 BP109 BP110 BP111`
	KEYWORD	`nice, noisy, dual, handed, rotate, orderedpair, traditional`
	CONCEPT	`positive_negative_slope (info \| search),` `line_slope (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Three simple lines vs. three complex lines.

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	CROSSREFS	`Adjacent-numbered pages: BP102 BP103 BP104 BP105 BP106 * BP108 BP109 BP110 BP111 BP112`
	KEYWORD	`number, traditional`
	CONCEPT	`number (info \| search),` `curve_texture (info \| search),` `texture (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Petals taper off vs. petals thicken.

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	CROSSREFS	`Adjacent-numbered pages: BP103 BP104 BP105 BP106 BP107 * BP109 BP110 BP111 BP112 BP113`
	KEYWORD	`nice, traditional`
	CONCEPT	`all (info \| search),` `size_increase_decrease (info \| search),` `protrusion (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Circle on the right of the box vs. circle on the left of the box.

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	CROSSREFS	`Adjacent-numbered pages: BP104 BP105 BP106 BP107 BP108 * BP110 BP111 BP112 BP113 BP114`
	KEYWORD	`noisy, dual, handed, leftright, traditional`
	CONCEPT	`absolute_position (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Four out of five objects are circles vs. never four out of five objects are circles.

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	CROSSREFS	`Adjacent-numbered pages: BP105 BP106 BP107 BP108 BP109 * BP111 BP112 BP113 BP114 BP115`
	KEYWORD	`number, traditional`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

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