Ten seemingly identical unicorns are presented in a row, with one slightly different. Spotting the odd unicorn in 12 seconds tests your attention to detail. Optical illusions trick our brains and this challenge highlights how such puzzles benefit brain function and vision, encouraging a sharp eye and creative thinking. Ten seemingly identical unicorns are presented in a row, with one slightly different. Spotting the odd unicorn in 12 seconds tests your attention to detail. Optical illusions trick our brains and this challenge highlights how such puzzles benefit brain function and vision, encouraging a sharp eye and creative thinking. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle