Everybody is their own self and we may all see things differently. Although we see things differently, my results show that everyone finally does see the illusion. It may take a while, but finally all see the illusion. Some people just do not see anything, but with a little help they too can see the illusion. I guess it just depends on you.
Illusions are just errors in perception of the illusion.
They are differences in the appearance of a measurable aspect of the world such as size, distance, and shape. Sometimes there are hidden things in a picture. There may be another picture or a design inside the original picture. We get used to how things are supposed to be, and sometimes our brains get the clues all wrong.