Optical illusions provide entertainment while enhancing cognitive skills. A recent challenge tasks participants with finding a hidden hammer among various items on a shelf within 7 seconds. This exercise tests observation skills, focus, memory, and problem-solving abilities. Regular engagement with such puzzles can also help reduce stress and improve mental agility. Optical illusions provide entertainment while enhancing cognitive skills. A recent challenge tasks participants with finding a hidden hammer among various items on a shelf within 7 seconds. This exercise tests observation skills, focus, memory, and problem-solving abilities. Regular engagement with such puzzles can also help reduce stress and improve mental agility. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle