This spot-the-difference test looks easy—two near-identical images of a father and son—but the 21-second timer raises the stakes. Your eyes perform rapid jumps called saccades, typically 2–5 per second, which means you have roughly 42–105 fixations to scan both images before time runs out. Efficiently spending those fixations is the…
Optical illusions have long fascinated both scientists and enthusiasts alike, offering a unique glimpse into the complexities of human perception. One such illusion making waves recently is a cave-themed psychedelic image that challenges viewers to spot the hidden number 29. This puzzle is not just a test of visual acuity…