The On-Line Encyclopedia of Bongard Problems

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Angle bisectors meet at the incenter vs. perpendicular bisectors meet at the orthocenter.

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	CROSSREFS	`Adjacent-numbered pages: BP166 BP167 BP168 BP169 BP170 * BP172 BP173 BP174 BP175 BP176`
	KEYWORD	`nice, math, traditional`
	CONCEPT	`triangle_incenter (info \| search),` `triangle_orthocenter (info \| search),` `triangle (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Small variance of slopes vs. large variance of slopes.

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	CROSSREFS	`Adjacent-numbered pages: BP168 BP169 BP170 BP171 BP172 * BP174 BP175 BP176 BP177 BP178`
	KEYWORD	`nice, spectrum, traditional, continuous`
	CONCEPT	`all (info \| search),` `pattern_or_random (info \| search),` `line_slope (info \| search),` `statistical_variance (info \| search),` `similar (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Line that connects dots avoiding obstacles is short vs. line that connects dots avoiding obstacles is long.

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	CROSSREFS	`Adjacent-numbered pages: BP171 BP172 BP173 BP174 BP175 * BP177 BP178 BP179 BP180 BP181`
	KEYWORD	`nice, spectrum, traditional, continuous`
	CONCEPT	`length_line_or_curve (info \| search),` `path (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Black region narrows at the boundary of black/white vs. black region widens at the boundary of black/white.

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	CROSSREFS	`Adjacent-numbered pages: BP175 BP176 BP177 BP178 BP179 * BP181 BP182 BP183 BP184 BP185`
	KEYWORD	`nice, dual, traditional`
	CONCEPT	`size_increase_decrease (info \| search),` `outlined_filled (info \| search),` `tracing_line_or_curve (info \| search),` `texture (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Concave if proximal border points are connected vs. convex if proximal border points are connected.

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	CROSSREFS	`Adjacent-numbered pages: BP177 BP178 BP179 BP180 BP181 * BP183 BP184 BP185 BP186 BP187`
	KEYWORD	`nice, traditional`
	CONCEPT	`concave_convex_angle (info \| search),` `near_far (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Orifice on the left vs. orifice on the right.

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	CROSSREFS	`Adjacent-numbered pages: BP186 BP187 BP188 BP189 BP190 * BP192 BP193 BP194 BP195 BP196`
	KEYWORD	`nice, traditional`
	CONCEPT	`entrance_exit (info \| search),` `left_right (info \| search)`
	WORLD	`[smaller \| same \| bigger]`
	AUTHOR	`Harry E. Foundalis`

Elongated vertically vs. elongated horizontally.

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	CROSSREFS	`Adjacent-numbered pages: BP187 BP188 BP189 BP190 BP191 * BP193 BP194 BP195 BP196 BP197`
	KEYWORD	`nice, noisy, traditional`
	CONCEPT	`convex_hull (info \| search),` `elongated_compact (info \| search),` `horizontal (info \| search),` `vertical (info \| search)`
	WORLD	`[smaller \| same \| bigger]`
	AUTHOR	`Harry E. Foundalis`

Ghost triangle vs. Ghost rectangle.

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	CROSSREFS	`Adjacent-numbered pages: BP188 BP189 BP190 BP191 BP192 * BP194 BP195 BP196 BP197 BP198`
	KEYWORD	`nice, anticomputer, traditional, dithering`
	CONCEPT	`absence_as_presence (info \| search),` `completed_out_of_box (info \| search),` `ghost (info \| search),` `number (info \| search),` `imagined_shape (info \| search),` `imagined_entity (info \| search),` `triangle (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Background is a parallelogram vs. background is a triangle.

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	CROSSREFS	`Adjacent-numbered pages: BP189 BP190 BP191 BP192 BP193 * BP195 BP196 BP197 BP198 BP199`
	KEYWORD	`easy, nice, noisy, traditional`
	CONCEPT	`shape_background (info \| search),` `number (info \| search),` `imagined_shape (info \| search),` `imagined_entity (info \| search),` `triangle (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Light-colored texture vs. dark-colored texture.

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	COMMENTS	`More white than black vs. more black than white.`
	CROSSREFS	`See BP211 for a version of this Problem that includes as examples more general kinds of images than uniform textures.` `Adjacent-numbered pages: BP191 BP192 BP193 BP194 BP195 * BP197 BP198 BP199 BP200 BP201`
	KEYWORD	`easy, nice, spectrum, dual, blackwhite, traditional, continuous, viceversa, dithering`
	CONCEPT	`light_dark (info \| search),` `texture_area (info \| search),` `texture (info \| search)`
	WORLD	`[smaller \| same \| bigger] zoom in left \| zoom in right`
	AUTHOR	`Harry E. Foundalis`

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