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This is the keyword "metaworld" on the OEBP.
These are used under-the-hood by the OEBP system to display the world of a Bongard Problem; that is the main reason these pages exist.
Left examples sort all Bongard Problems and thus have "world" Bongard Problems (i.e. fit on left-BP524).
The "world" of a BP is the pattern seen in all examples once the dividing line is removed.
Many BPs are sorted leftly by only one MBP that is a left example for this MMBP, i.e. a BP most naturally has one specific world.
In some cases it is ambiguous what the most obvious choice of "world" for a BP is.
For example, is the "world" of BP6 "polygons" or "triangles and quadrilaterals"? Someone seeing all the images together, without a line dividing them, might consider them to have pattern "triangles and quadrilaterals." Or that specificity might not be considered important enough to mention; the obvious and simple collection both sides fall into is "polygons." It is ambiguous: the world could be "triangles and quadrilaterals" or it could be "polygons." In the MBPs about worlds, we will err on the side of inclusion: it is okay to indicate a BP has more than one world if its situation is not clear-cut, as in this example.
However, do not arbitrarily use worlds that are too big; the world of BP6 is not "shapes." | 
