This document discusses various three-dimensional audiovisual aids that can provide a touch of reality, including models, objects, specimens, dioramas, puppetry, mock ups, moulages, globes, exhibitions, museums, and various graphic aids. It describes solid models that replicate the original, cut-away or x-ray models that show internal parts, working models that are actual working objects, and more. Puppetry is described as an educational and entertaining aid using manipulated dolls. Graphic aids include diagrams, flashcards, posters, handouts, pamphlets, and leaflets.