Optical illusions offer a fun way to test your brain’s perception and processing speed. The challenge involves finding a fruit or vegetable without a pair among various paired items within 10 seconds. This activity not only entertains but also helps to sharpen cognitive skills. Optical illusions offer a fun way to test your brain’s perception and processing speed. The challenge involves finding a fruit or vegetable without a pair among various paired items within 10 seconds. This activity not only entertains but also helps to sharpen cognitive skills. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle