In Latin, illudere means to mock or trick, which is the origin of the word illusion.
To give us a sensory experience, our brain fills in information gaps from the eyes. We call it perception.
Optical illusion pictures are one of the easiest brain attention tests.
Optical illusion pictures have also been used by neuroscientists to study reality perception.
Practicing optical illusion puzzles may improve problem-solving and lateral thinking.
The image above shows two hunters with dogs in the woods.A fox that escaped is being sought.
Foxes blend into their surroundings, making them hard to spot.Only the most attentive readers will spot the fox faster.