28. An educational device as claimed in claim 27 wherein said electronic devices comprise: read-only-memories (ROMs) containing pre-programmed sets of said pairs of original indicia and secondary indicia; said read-only-memory can be incrementally addressed through manual activation of a pop-in-and-out switch, memory address being incremented by pushing said pop-in-and-out switch in the medallion and subsequently releasing said pop-in-and-out switch; output displays niched in said medallions, said output displays showing said pairs of said original indicia and said secondary indicia stored at current addresses of said read-only-memories.
28. An educational device as claimed in claim 27 wherein said electronic devices comprise: read-only-memories (ROMs) containing pre-programmed sets of said pairs of original indicia and secondary indicia; said read-only-memory can be incrementally addressed through manual activation of a pop-in-and-out switch, memory address being incremented by pushing said pop-in-and-out switch in the medallion and subsequently releasing said pop-in-and-out switch; output displays niched in said medallions, said output displays showing said pairs of said original indicia and said secondary indicia stored at current addresses of said read-only-memories. 29. An educational device as claimed in claim 28 wherein: said lids of said medallions are externally ornamented with stones which stone colors match a plurality of colors of color-coded keys to be struck by said finger of said hand; said stones being cut into geometrical patterns, said geometrical patterns having shapes which shape names begin with a letter corresponding to the key of the keyboard to be struck by said finger of said hand.