14. A communication and teaching aid as recited in claim 13 wherein said informative indicia on at least one of said plurality of demonstrative pieces comprises pictorial representations and said pictorial representations on said subject-related ones of said plurality of demonstration pieces are all representative of one of said plurality of categories.
14. A communication and teaching aid as recited in claim 13 wherein said informative indicia on at least one of said plurality of demonstrative pieces comprises pictorial representations and said pictorial representations on said subject-related ones of said plurality of demonstration pieces are all representative of one of said plurality of categories. 15. A communication and teaching aid as recited in claim 14 wherein said informative indicia on others of said plurality of demonstration pieces further comprises alpha-numeric displays, said alpha-numeric displays on said subject-related ones of said plurality of demonstration pieces are all representative of one of said plurality of categories.