5. A communication aid as recited in claim 4 wherein said plurality of support structures and said number of subject-related demonstration pieces have equivalent code means formed thereon which are representative of a common one of said plurality of categories.
5. A communication aid as recited in claim 4 wherein said plurality of support structures and said number of subject-related demonstration pieces have equivalent code means formed thereon which are representative of a common one of said plurality of categories. 6. A communication aid as recited in claim 5 wherein said code means comprises color coding of said plurality of support structures and said plurality of demonstration pieces.