Another 4th grade Optical Illusion! This one was inspired by an artwork I found on Etsy. I had the kids create a grid. In each box they placed a large shape and in each of those shapes, a second smaller shape. They drew a line from one side to the other going through each shapes. Sometimes they had to introduce a second or third line. They then checker boarded the design. This one was really successful. I will do it again!