Bhubaneswar, Nov. 8 -- Illusion is derived from the word illudere, which means to mock or trick. So, the primary idea of an optical illusion is to deceive the human brain by tricking it. There are three types of optical illusions- literal, physiological, and cognitive.

The beauty of optical illusions is that they engage the user's attention for a brief time, which helps sharpen the brain.

So if you are an optical illusion enthusiast, here's one that might intrigue you. It challenges you to spot 3 UNCARVED pumpkins among a heap of carved pumpkins within nine seconds.

The picture shows a heap of carved pumpkins. What makes it difficult to spot the UNCARVED pumpkins is that they are perfectly camouflaged between the pumpkins.

The illustr...