Last week I pinned a fabulous optical illusion art idea from We Heart Art. She had completed this activity with her fifth graders, and I thought it would make a fantastic first lesson for my students. I tried it out with my oldest daughter last weekend (she's in grade 3), and when she achieved great results, I knew it would be perfect. This is a perfect art lesson for the beginning of the year because it uses only a few materials, has simple directions, and turns out to be an impressive work…