Studying M.C. Escher? In addition to his work in tessellations and optical illusions, don't forget his metamorphosis transformations (or morphing drawings). A couple of Escher examples and a couple of examples are included. Then students can try their hand at morphing a fish to an eye. Lastly, students get 5 steps to choose what to morph themself.
 
I use this along with my study on Optical Illusions worksheets, Art & Geometry/Math: M.C. Escher Drawing Impossible Shapes & Tessellations, and M. C. Escher Art & Math: Advanced Tessellation Design Worksheet Lesson