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========== Okay, take a look at this optical illusion. Are the lines parallel… or not? What about this one? Is the black line a continuation of the red
line, or the blue line? Or if it’s misaligned, which direction does
it have to move in to be in line with the red one? These are examples of geometrical-optical
Illusions – namely the Zöllner and Poggendorff illusions. The Zöllner illusion is made up of diagonal
lines – they are parallel – but they’re crossed with shorter lines that alternate
between horizontal and vertical. The angles of these shorter lines give the
impression that the diagonal lines are not parallel. In the Poggendorff illusion, we have a tendency
to misestimate the unknown angles hidden by the rectangle – the acute angles have an
effect...