This is a fun take on the the hollow face illusion that you see at many amusement parks. Students can make their own hollow face illusion with this printable, and also learn the difference between concave and convex shapes. This comes with: *Student Worksheet *Printable cut out *Detailed instructions on how to put together the optical illusion. To see what the optical illusion looks like, check out my Instagram ! Here is a link to the full free video to show you how to put it together! Vide