Circles appear to expand, stare the picture and you will notice that the Circle are expanding

"maccha" means kind of Japanese green tea. Each of four pieces of green mist appears to expand.

Concentrate on the center point of the circle and you will see that it starts moving as well as expanding. Actually it the lines are the same and are not moving.This is just an illusion to your eyes

When you move your head toward the image, it appear to be expanding and when u move your head away from image the image will appear to contrast

This is similar to the moving illusion, Each ray appears to move outward and circle seems to dancing while you look at the center closely.