Pittsburgh Zoo logo hides secret optical illusion – can you spot the four animals inside?

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 PressIf you look closely, you can see four animals hidden in this logo

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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.

Lions sit on rocks at the Pittsburgh Zoo

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Lions sit on rocks at the Pittsburgh ZooCredit: GettyGiraffes and zebras walk on the grass at the Pittsburgh Zoo

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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

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