New Delhi, June 11 -- The fascination with optical illusions dates back to Greek philosophers like Epicharmus, Protagoras, Plato, and Aristotle, who first explored how our eyes, brain, or a combination of both can deceive us into perceiving things that are not actually there.

In the 19th century, psychologists Johannes Mueller and J.J. Oppel reignited their interest in optical illusions and conducted extensive studies on the subject.

Around the same time, German physicist Hermann von Helmholtz termed "cognitive illusions" as an illusion which occurs when our expectations of reality conflict with what we actually see.

Later, it was categorised into four types: distorting, paradoxical, fictional, and ambiguous.

If you find optical illus...