New Delhi, Aug. 1 -- Optical illusions and visual puzzles are all the rage these days due to their ability to enthrall social media users. These brain teasers improve cognitive functions and are a fun way to pass the time. They can also teach a person some skills that can improve their awareness of their surroundings. Be it looking for the odd word or number in a grid or finding a perfectly camouflaged animal in a natural setting, these optical illusions are all about proving that first appearances can be deceiving.

A brain teaser on Pinterest has grabbed the attention of all math lovers. The visual puzzle challenges people to calculate the amount represented by the birds. Each type of bird indicates a different number. The challenge is ...