Left-sorted Problems usually have a very specific collection of examples, where the only images sorted show the same type of object.

Left-sorted Problems usually have a very specific collection of examples, where the only images sorted show a specific type of object.

Bongard Problems where adding anything to any sorted example renders the example unsortable vs. other Bongard Problems.

Bongard Problems where adding anything to (or removing anything from) any sorted example renders the example unsortable vs. other Bongard Problems.

Left-sorted Problems usually have very specific "worlds", where the only images sorted contain 1 specific object.

Leo Crabbe