The On-Line Encyclopedia of Bongard Problems

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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`

Two of the shapes make tiles along their border lines vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP196 BP197 BP198 BP199 BP200 * BP202 BP203 BP204 BP205 BP206`
	KEYWORD	`noisy, traditional`
	CONCEPT	`rotation_required (info \| search),` `tiling (info \| search),` `imagined_motion (info \| search),` `motion (info \| search)`
	WORLD	`fill_shapes [smaller \| same \| bigger]`
	AUTHOR	`Giuseppe Insana`

Even number vs. odd number.

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	CROSSREFS	`See BP334 for a version of the same idea, but using dots instead of arbitrary shapes.` `Adjacent-numbered pages: BP197 BP198 BP199 BP200 BP201 * BP203 BP204 BP205 BP206 BP207`
	KEYWORD	`noisy, number, traditional`
	CONCEPT	`even_odd (info \| search)`
	AUTHOR	`Giuseppe Insana`

Five vs. four.

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	CROSSREFS	`Adjacent-numbered pages: BP199 BP200 BP201 BP202 BP203 * BP205 BP206 BP207 BP208 BP209`
	KEYWORD	`noisy, number, traditional`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Giuseppe Insana`

Two clusters of two elements each vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP200 BP201 BP202 BP203 BP204 * BP206 BP207 BP208 BP209 BP210`
	KEYWORD	`traditional`
	CONCEPT	`feature_cluster (info \| search),` `cluster (info \| search),` `similar_shape (info \| search),` `similar (info \| search),` `two (info \| search)`
	AUTHOR	`Giuseppe Insana`

Curve ends in a roughly up or down direction vs. curve ends in a roughly left or right direction.

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	CROSSREFS	`Adjacent-numbered pages: BP201 BP202 BP203 BP204 BP205 * BP207 BP208 BP209 BP210 BP211`
	KEYWORD	`traditional`
	CONCEPT	`downward_upward (info \| search),` `slope_at_endpoint (info \| search),` `line_or_curve_endpoint (info \| search),` `horizontal (info \| search),` `leftward_rightward (info \| search),` `tangent_absolute_direction (info \| search),` `absolute_direction (info \| search),` `vertical (info \| search),` `direction (info \| search)`
	AUTHOR	`Giuseppe Insana`

Curve ends on the left part of the box vs. curve ends on the right part of the box.

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	CROSSREFS	`Adjacent-numbered pages: BP202 BP203 BP204 BP205 BP206 * BP208 BP209 BP210 BP211 BP212`
	KEYWORD	`noisy, handed, leftright, traditional`
	CONCEPT	`absolute_position (info \| search),` `line_or_curve_endpoint (info \| search)`
	AUTHOR	`Giuseppe Insana`

All curves spiral counterclockwise, starting from maximum curvature vs. all curves spiral clockwise, starting from maximum curvature.

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	CROSSREFS	`Adjacent-numbered pages: BP203 BP204 BP205 BP206 BP207 * BP209 BP210 BP211 BP212 BP213`
	KEYWORD	`traditional`
	CONCEPT	`all (info \| search),` `turn_orientation (info \| search),` `tracing_line_or_curve (info \| search),` `rotational_direction (info \| search),` `direction (info \| search)`
	AUTHOR	`Giuseppe Insana`

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