Ideas-World (Plato) .

Ideas-world.
-In a museum hangs a blank canvas, with the signature "cow grazing in the meadow."
-Visitor: "I see no grass and no green?"
-Guard: "the cow has already been grazed the grass."
-Visitor, "but I also see no cow?"
-Guard: "you do not think the cow remains, when the grass is off".

-So with us in the world of ideas' ...
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