It's a spiral, right?
Take a closer look, it could be a grouping of circles.
The impossible elephant was drawn by American cognitive scientist Roger N. Shepard.
What do you see? A lady or a musician? See both?
How many faces do you see? 1,2 or three???What do you see?
A face or the word "liar"? This clever illustration was drawn by Paul Agule.
What do you see?A face or the word "liar"? This clever illustration was drawn by Paul Agule.
How many full cubes do you see? Six or seven?
Is the following object physically possible?
Which vertical line is longer? They are both the same length.Measure them.
How many prongs does this fork have?
Are the two purple lines parallel or are bent?
What do you see?
Rectangles? Diamonds? or both?
Do the solid black lines seem to bend?
Use a straight edge to see if they do bend.
What do you see?
A duck or a rabbit?
Are the circles inside or outside of this image?
Is the circle below perfectly round?
Reference: http://www.eyetricks.com
