THE Pittsburgh Zoo logo is hiding a secret optical illusion.
There are four animals hidden within the brain-puzzling image.
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Children look through a window at an elephantCredit: AP:Associated Press
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If you look closely, you can see four animals hidden in this logoCredit: Pittsburgh Zoo
At first glance, a tree appears to be the main focal point.
But if you look closely, you can see a gorilla along the left outline of the tree looking across at a lioness.
An even closer look reveals birds flying above the tree and fish that appear to be jumping out of the water at the bottom of the tree.
Mind-boggling illusions have been stumping people for years.
Not everyone views optical illusions in the same way.
One element of these illusions is contrast sensitivity, which is a measure of the ability of the visual system to distinguish an object from its background.
A target must be big enough to be seen but also be of high enough contrast with its background, according to Science Direct.
Eye-related conditions or diseases such as cataracts, glaucoma or diabetic retinopathy can affect a person’s contrast sensitivity.
Most people use the terms “optical illusion” and “visual illusion” interchangeably, but they’re different.
Optical illusions are specific to how light interacts with matter like how a pencil looks bent when placed in a glass of water.
Visual illusions are caused by the processing in the visual system.
Some illusions can reveal something about your personality.
Others reveal how you feel about life.
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Lions sit on rocks at the Pittsburgh ZooCredit: Getty
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Giraffes and zebras walk on the grass at the Pittsburgh ZooCredit: Getty
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Categories: Optical Illusion
Source: HIS Education