Students will have fun creating the illusion of 3D objects from a specially-designed 2D printout. We will begin by examining a variety of common optical illusions and what makes them work. Then, using a document camera, I will demonstrate how to draw a pattern of straight lines on the printout, that, when folded and viewed from a particular angle, will give the illusion that the 2D drawing has become a 3-dimensional ladder and a cube. Finally, I will demonstrate how to take a photograph of the completed project. Having a picture of the object not only enhances the illusion experience, but it allows them to share their work with others. To complete this part of the project, students should have access to a phone or tablet camera.