The document discusses different types of non-projected visual aids that can be used in a classroom, including real objects, models, exhibits, printed materials, graphics, and photographs. Some examples provided are rocks, fossils, models of the heart and solar system, dioramas, books, posters, and photographs. The document states that these basic visual aids have been effectively used in classrooms for many years and can help students learn in various ways like homework, projects, and plain teaching.