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Opprints Visual Illusions

Ponzo Illusion

Look at the two horizontal lines. Which of them is shorter?

Generally the lower of the two lines appears shorter. The diagonal lines on either side make it hard to judge the correct length.

Click on the image to hide the diagonal lines or use a ruler to compare the two horizontal lines.

Yes, both lines are the same length.

Click on the image to reveal the diagonal lines again.

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©2002 Opprints

©2002 Opprints

www.opprints.co.uk