Optical illusion challenge: Find three concealed ducklings in under 7 seconds.  

The word optical illusion is derived from the Latin verb 'illudere', which meant to mock or fool.   

Optical illusion images are designed to fool human perception, and they can sometimes be used as a simple test to determine one's mental and visual acuity.   

Optical illusions may greatly fascinate and perplex our thoughts with their appealing artwork, difficult riddles, and intriguing designs.   

Today's activity will feature a black-and-white shade image. You will see a large duckling in a pond with little plants and shrubs nearby.   

Now you must locate the remaining three ducklings, which are perfectly hidden in the photograph.  

You have only 7 seconds to solve the optical illusion and demonstrate your strong and active eyesight, as well as your excellent cognitive strength.  

Now that the 7-second timer has run out, congratulations if you've solved this optical illusion puzzle.   

If not, don't worry, we have plenty of comparable activities, such as interactive brain teasers and more.   

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