There is a slight ambiguity here regarding whether a shape could be placed within another shape's hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table in 2D or are we allowed to 'lift' them in 3D space?

There is a slight ambiguity here regarding whether a shape could be placed within another shapes hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table in 2D or are we allowed to 'lift' them in 3D space?

There is a slight ambiguity here regarding whether a shape could be placed within another shapes hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table (or lowering them into a rectangular bin, similar to Tetris) or are we allowed to 'lift' them in 3D space?

Black shapes can be arranged such that they fit inside rectangular outline vs. not so.

There is a slight ambiguity here regarding whether a shape could be placed within another shapes hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table or are we allowed to 'lift' them in 3D space (or are we even dropping the shapes into a rectangular bin under gravity? This would be a 2D problem but equivalent to the 3D table case).

Leo Crabbe

Metaworld Bongard Problems for sub-worlds of triangle and circle outlines allowed to nest (BP891) vs. other metaworld Bongard Problems.

Metaworld Bongard Problems for subworlds of triangle and circle outlines allowed to nest (BP891) vs. other metaworld Bongard Problems.

Metaworld Bongard Problems for triangle and circle outlines allowed to nest (BP891) vs. other metaworld Bongard Problems.

Aaron David Fairbanks