Optical illusions have long fascinated the human mind, causing havoc with our senses and intelligence. Such puzzles not only entertain us but also test our IQ, observation, and thinking. We have an interesting task today that will test your observation. Optical illusions have long fascinated the human mind, causing havoc with our senses and intelligence. Such puzzles not only entertain us but also test our IQ, observation, and thinking. We have an interesting task today that will test your observation. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle