Left examples have the keyword "structure" on the OEBP.

Examples of "structures": Bongard Problem, Bongard's Dozen, 4-panel analogy board, sequence of objects with a constant quantity changing from object to object that together represent the quality that is changing, sequence of objects paired with clump of n dots together representing the nth object that should come in the sequence.

If the solver hasn't become familiar with the specific featured structure, the Bongard Problem's solution may seem convoluted or inelegant. Once the solver gets used to seeing a particular structure it becomes easier to parse that structure and solve Bongard Problems featuring it.

All possible variations of the specific structure include the "world" of the Bongard Problem.

It may be useful to teach the details of how a particular structure works via a Bongard Problem, showing valid examples of that structure versus invalid structures that don't fit the definition. Examples are BP968 for the structure of Bongard Problems and BP981 for the structure of analogy grids. (See BP858 for more Problems that teach things.)