Optical illusion pictures are effective for assessing one’s intelligence and observational skills. Participants are challenged to find a hidden cheetah among gazelles in a photo taken in Botswana. Identifying the cheetah within 11 seconds indicates keen observation skills. Optical illusion pictures are effective for assessing one’s intelligence and observational skills. Participants are challenged to find a hidden cheetah among gazelles in a photo taken in Botswana. Identifying the cheetah within 11 seconds indicates keen observation skills. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle