The On-Line Encyclopedia of Bongard Problems

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Arrows pointing in different directions vs. arrows pointing in the same direction.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 231.`
	CROSSREFS	`Adjacent-numbered pages: BP47 BP48 BP49 BP50 BP51 * BP53 BP54 BP55 BP56 BP57`
	KEYWORD	`finished, traditional, bongard`
	CONCEPT	`arrow (info \| search),` `tracing_lines_or_curves_meet (info \| search),` `pointing_to (info \| search),` `tracing_line_or_curve (info \| search),` `imagined_point (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Mikhail M. Bongard`

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`

No cycle vs. a cycle exists.

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	CROSSREFS	`Adjacent-numbered pages: BP113 BP114 BP115 BP116 BP117 * BP119 BP120 BP121 BP122 BP123`
	KEYWORD	`traditional`
	CONCEPT	`arrow (info \| search),` `cyclic_path (info \| search),` `existence (info \| search),` `path (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

The circles will collide if the arrows are their velocities vs. the circles will not collide if the arrows are their velocities.

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	CROSSREFS	`Adjacent-numbered pages: BP353 BP354 BP355 BP356 BP357 * BP359 BP360 BP361 BP362 BP363`
	KEYWORD	`nice, physics, unorderedpair, traditional`
	CONCEPT	`arrow (info \| search),` `tracing_lines_or_curves_meet (info \| search),` `speed (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `imagined_motion (info \| search),` `motion (info \| search),` `collision (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

Counterclockwise along the curve following the arrow vs. clockwise along the curve following the arrow.

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	CROSSREFS	`Adjacent-numbered pages: BP358 BP359 BP360 BP361 BP362 * BP364 BP365 BP366 BP367 BP368`
	KEYWORD	`easy, nice, dual, handed, leftright, updown, gap, traditional`
	CONCEPT	`arrow (info \| search),` `turn_orientation (info \| search),` `tracing_line_or_curve (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

Arrows which if moved at speeds proportional to their length would pass eachother vs. not so

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	CROSSREFS	`Adjacent-numbered pages: BP1251 BP1252 BP1253 BP1254 BP1255 * BP1257 BP1258 BP1259 BP1260 BP1261`
	KEYWORD	`precise, physics, unorderedpair, traditional`
	CONCEPT	`arrow (info \| search)`
	AUTHOR	`Matt Samuels`

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