Brain teasers and optical illusion puzzles can help you prepare ... shoe within a sharp timeline of 12 seconds from the black-and-white frame to prove that you have strong and sharp eyesight.

Look for a series of alternating black-and-white keys. The keyboard may appear disguised but will stand out with closer attention. It is difficult to solve this optical illusion because the black ...

Humans interpret things differently. And perception-based activities such as optical illusions can be a great way to activate the brain, because how we interpret these activities can often ...

What started as a simple photo of a dress spiraled into a global optical illusion phenomenon, dividing millions into two passionate camps.