Hi kids! What do you see in this image? A girl's face or a musician playing the sax?
Now stare at the cross and quickly move your head forward and backward, towards and away from the screen. The circles will appear to be moving.They are optical illusions: visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source.
There are three main types:
- literal optical illusions, which create images that are different from the objects that make them,
- physiological illusions, which are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and
- cognitive illusions, where the eye and brain make unconscious inferences. They can also be known as "mind games".
Now have a look a this picture. The horizontal lines are parallel, even if they seem otherwise.
In the picture below the two circles seem to move when the viewer's head is moving forward and backward while looking at the black dot. Interesting, isn't it?
And now, a portrait of Don Quixote. Look closely and you'll be amazed!
As Jenna Marble (US entertainer and Youtube personality says:
"There's no cure for ugly, but you can make yourself into a human optical illusion".
See you!
