19. An educational device as claimed in claim 15 wherein: said first set of upper-internal indicia of said medallions of said rings on said fingers comprise three-dimensional structures defining objects which object names begin with a letter corresponding to the key of the keyboard to be struck by said finger of the left hand, said three-dimensional structures having their base mounted onto the internal movable side of said medallions; said second set of upper-internal indicia of said medallions of said rings on said fingers comprise three-dimensional structures defining objects which object names begin with a letter corresponding to the key of the keyboard to be struck by said finger of the right hand, said three-dimensional structures having their base mounted onto the internal movable side of said medallions.
20. An educational device as claimed in claim 19 wherein said internal movable sides of said medallions comprise first magnets, said bases of said three-dimensional structures comprising second magnets of opposite polarity of said first magnets, said first and second magnets creating attractive forces binding said three-dimensional structures onto said internal movable side of said medallions.