The On-Line Encyclopedia of Bongard Problems

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Axis of symmetry vs. no axis of symmetry.

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	CROSSREFS	`Adjacent-numbered pages: BP260 BP261 BP262 BP263 BP264 * BP266 BP267 BP268 BP269 BP270`
	CONCEPT	`symmetry_axis (info \| search),` `symmetry (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

At least one touch or cross point vs. no touch or cross point.

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	CROSSREFS	`Adjacent-numbered pages: BP261 BP262 BP263 BP264 BP265 * BP267 BP268 BP269 BP270 BP271`
	CONCEPT	`x-crossing (info \| search),` `or (info \| search),` `existence (info \| search),` `t-point (info \| search)`
	WORLD	`arial_font_centered_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Odd number of straight line segments vs. even number of straight line segments.

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	CROSSREFS	`Adjacent-numbered pages: BP262 BP263 BP264 BP265 BP266 * BP268 BP269 BP270 BP271 BP272`
	CONCEPT	`even_odd (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Only vertical or horizontal lines vs. neither vertical nor horizontal lines.

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	CROSSREFS	`Adjacent-numbered pages: BP265 BP266 BP267 BP268 BP269 * BP271 BP272 BP273 BP274 BP275`
	CONCEPT	`or (info \| search),` `horizontal (info \| search),` `vertical (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Can be hand-written without raising the pen vs. cannot be hand-written without raising the pen.

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	CROSSREFS	`Adjacent-numbered pages: BP266 BP267 BP268 BP269 BP270 * BP272 BP273 BP274 BP275 BP276`
	CONCEPT	`write_in_single_stroke (info \| search)`
	WORLD	`arial_font_centered_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Convex hull is a triangle vs. convex hull is a quadrilateral.

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	COMMENTS	`Note: Thickness of letters is to be disregarded. If the font is paid attention to, the solution does not work. - Aaron David Fairbanks, Dec 01 2021`
	CROSSREFS	`Adjacent-numbered pages: BP267 BP268 BP269 BP270 BP271 * BP273 BP274 BP275 BP276 BP277`
	CONCEPT	`convex_hull (info \| search),` `number (info \| search),` `triangle (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Notch from above (holds poured water) vs. no notch from above (does not hold poured water).

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	CROSSREFS	`Adjacent-numbered pages: BP269 BP270 BP271 BP272 BP273 * BP275 BP276 BP277 BP278 BP279`
	KEYWORD	`notso, physics`
	CONCEPT	`concave_convex_region (info \| search),` `downward_upward (info \| search),` `line_absolute_direction (info \| search),` `absolute_direction (info \| search),` `direction (info \| search),` `liquid_flow (info \| search),` `gravity (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

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