Optical illusions like the hidden cactus challenge can test and enhance observation skills, cognitive flexibility, and attention to detail. The cactus, cleverly camouflaged, showcases the brain’s ability to process visual information effectively when engaged in such exercises. Optical illusions like the hidden cactus challenge can test and enhance observation skills, cognitive flexibility, and attention to detail. The cactus, cleverly camouflaged, showcases the brain’s ability to process visual information effectively when engaged in such exercises. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle