Optical Illusion/Optical Art project 4th grade

We start this project with a square in the middle of our paper.  We then do a simple line illusion in the center with step by step instructions. This square with a line design in it was found in an old art project book from the 1970s, but any simple illusion found on the internet would work as well.

A sphere illusion in the middle looks great too!

Next we divide our paper into 4 sections and look at pictures of op art and optical illusions. I give the students ideas of how they could use markers, crayons, colored pencils or drawing pencil to make 4 different pieces of optical art/illusions to complete the composition.
This is  a favorite project of my 4th graders, they love to "trick people's eyes!"

This is amazing work!