### Color Assimilation

This figure is
from Dr. Irtel .

Take two pieces of paper and place their edges as close as possible to both sides of
one red diagonal. Note that the red square in the middle is the same as all the other
squares on that diagonal. Now move your pieces of paper to expose mainly the red squares
on the other diagonal. On this diagonal all the red squares, including the center
one, are again the same color red. Because the center square is common to both diagonals
this exercise proves that all the red squares in both diagonals are exactly the same red
color. Yet, when the pattern is seen as a whole, the two red diagonals appear different
from each other.

Explanation

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