Important information about tourism in Costa Rica - Florida

In this optical illusion by Victoria Skye, the blue stripes seem to slope up and down, but they're actually level and parallel. 

On close examination, the little diamond shapes in the top blue stripe tilt a little to the left. They tilt to the right on the second and fourth stripe. Those tilting diamonds seem to influence our perception of the slope of each blue stripe.

Squinting overcomes the illusion because it eliminates those fine grained distractors.
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Visit her website of illusions and impossible objects