India, May 17 -- Optical illusions have a unique way of capturing our attention. These brain-teasing puzzles play tricks on our perception, often leaving us second-guessing what we see. From shifting shapes to deceptive designs, optical illusions are more than just fun-they challenge the way our brains process information. If you're a fan of this mind-bending form of entertainment, then this puzzle shared on Facebook is sure to get you thinking.

(Also read: Optical illusion: You'll be called next-level observant if you spot hidden elephant in this image)

The puzzle in question was posted by Facebook user Arshdeep Soni. At first glance, the image appears simple: four grey rectangular shelves stacked vertically. But, as with most optical ...