"Simple" means bounded, smooth boundary except for discrete corners, finite number of holes. Usually "easy to draw." Important: it is allowed to have holes in it.

The "world" of a Bongard Problem is the pattern that all examples, left and right, seem to together satisfy.

Thus for a BP to be a left example in this meta-BP, it must only include simple 2D shapes as examples, and there must be no other more specific simple pattern all examples satisfy.

"Simple" means bounded, smooth boundary except for discrete corners, finite number of holes. Usually "easy to draw." Important: it is allowed to have holes in it.

The "world" of a Bongard Problem is the pattern that all examples, left and right, seem to together satisfy.

Thus for a BP to be a left example for this meta-BP, it must only include simple 2D shapes as examples, and there must be no other more specific simple pattern all examples satisfy.

"Simple" means bounded, smooth boundary except for discrete corners, finite number of holes. Usually "easy to draw." Important: it is allowed to have holes in it.

"Simple" means bounded, smooth boundary, usually "easy to draw." It is allowed to have holes in it.

Bongard Problems with "world" one simple connected 2D shape.

Bongard Problems about single simple connected 2D shapes.