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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. | 
