The On-Line Encyclopedia of Bongard Problems

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Stays put vs. tumbles.

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	CROSSREFS	`BP273 has the same solution, except all examples are letters.` `Adjacent-numbered pages: BP194 BP195 BP196 BP197 BP198 * BP200 BP201 BP202 BP203 BP204`
	KEYWORD	`nice, handed, updown, rotate, physics, anticomputer, perfect`
	CONCEPT	`base (info \| search),` `downward_upward (info \| search),` `tumbles_or_stays_put (info \| search),` `line_absolute_direction (info \| search),` `absolute_direction (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `direction (info \| search),` `gravity (info \| search)`
	AUTHOR	`Harry E. Foundalis`

Stays put (both when placed on its top and bottom) vs. tumbles (when placed on its bottom).

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`See BP199 for the original "stays put vs. tumbles".` `Adjacent-numbered pages: BP268 BP269 BP270 BP271 BP272 * BP274 BP275 BP276 BP277 BP278`
	KEYWORD	`rotate, physics`
	CONCEPT	`base (info \| search),` `downward_upward (info \| search),` `tumbles_or_stays_put (info \| search),` `line_absolute_direction (info \| search),` `absolute_direction (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `direction (info \| search),` `gravity (info \| search)`
	WORLD	`arial_font_centered_connected_symbol [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

Unstable balance vs. not

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	REFERENCE	`https://en.wikipedia.org/wiki/Stability_theory`
	CROSSREFS	`Adjacent-numbered pages: BP546 BP547 BP548 BP549 BP550 * BP552 BP553 BP554 BP555 BP556`
	EXAMPLE	`The classic example is a pendulum with a solid rod (instead of a string) which has a stable balance point at the bottom of its swing, where if you move the pendulum slightly it will swing back towards that balanced state. However, theoretically the pendulum can also be balanced pointing directly up. In this case, if you move the pendulum slightly it will swing down away from that upwards balanced state.`
	KEYWORD	`updown, rotate, physics, anticomputer, perfect`
	CONCEPT	`tumbles_or_stays_put (info \| search),` `gravity (info \| search)`
	AUTHOR	`Jago Collins`

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