Are the Lines Straight?

#optical-illusion#perception#easy#lines#zollner

Are the purple lines straight and parallel?

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Imagine two perfectly horizontal parallel lines. Now place short diagonal tick marks crossing both lines — but the tick marks on the top line lean right, and the tick marks on the bottom line lean left. Do the two horizontal lines still appear straight and parallel to you? What is this illusion called, and what does it demonstrate?

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