Between drawing and sing
Three Kinds of Archaic Graphs and their Transitions to Modern Characters
Top Row: Complex single-element graphs whose modern parallels are direct descendants of archaic forms.
Middle Row: Simple multiple-element graphs lacking modern equivalents.
Bottom Row: Complex multi-element graphs with either modern descendants or equivalents.
Generally with the ablility to write kids loosing the ability to draw.
Probably it happend beacouse we are giving to them the tasks like this one.