The document provides instructions for an art exercise involving drawing on clear acetate sheets that are placed over photographs. Students will use markers or other media to draw on the acetate, and can then remove the underlying photo or layer multiple acetates. Examples are given of different techniques like using alcohol to erase marker on acetate, drawing the shapes seen in cloud photos, and painting on the underside of the acetate to obscure the photo. Tips are provided on adhering acetate to paper or other surfaces. The goal is for students to experiment with the various effects that can be created through drawing on and manipulating acetate over photographs.