Optical illusion: Only those with sharp vision can spot the hidden word 'book' in this family scene in 5 seconds
These puzzles and optical illusions have long fascinated people of all ages for centuries. More than an amusing time killer, they are a wonderful means to exercise the mind and sharpen the thinking process.
These puzzles and optical illusions have long fascinated people of all ages for centuries. More than an amusing time killer, they are a wonderful means to exercise the mind and sharpen the thinking process.
