Keep it simple! Organize 2D and 3D images and/or actual objects into this graphic organizer. Ideas: photos, paper clips, sprinkles etc. For the older students, discuss objects from a "mystery bag" an have students write out the name of object in the correct column. Then play a stand up game to reveal how the 2D and 3D objects were placed. Laminate and use in a center/station for individual understanding.