The production and use of tangible aids for teaching complete mental concepts to the blind are discussed. The Thermoform vacuum duplicating machine which produces teaching aids simulating pictures or drawings used by sighted children is described; and examples of Thermoform masters are cited, including Mendel's law, the maze, four stages of cell division, map of Pike's Peak, the human eye, house plan, campus map, earth science drawing, and others. Handmade apparatus and models discussed are the suspension bridge, the thermometer, the expressway interchange, model of the campus, the vacuum and pressure pump, the thermocouple, wave motion and magnets, electricity, the model water well, the solar system, and the soil erosion experiment. Other homemade techniques, variations of games, and adaptations of available teaching aids are considered, as are the following toy models, cutaways, and commercial products: plastic model kits, toy models, construction sets, magnetic boards, cutaway displays, war surplus items, the doll house, educational models and aids, the tangible moon, and tangible self-help dress kits. A discussion of teaching for greater meaning treats creative art work, the concept corner, the field trip, and the well rounded program. Thirty-one figures illustrate the various devices and aids described in the text. (DF)