Psychology teacher posted this riddle on the board today: the word "world" written four times. All the "worlds" are stacked on top of one another.
WORLD WORLD WORLD WORLD
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I think the teacher is indicating the following:
Many people see the world differently.
Why I think this is:
First off, the teacher is teaching psychology and such an answer seems right up their alley. Secondly, I can demonstrate several answers with little difficulty. The puzzle still makes sense but the 'trick' is to see past the riddle itself.
4 worlds = world series
For the world
The Matrix (pun on the mathematical definition)
I cannot choose any one of these over the other. In fact, everything indicates they are equally valid. This doesn't make the puzzle unclear. It just adds another layer of depth to this very intriguing rebus.