Schemes and models are visualisations of complex causualities. Try this: Picture human mankind. 1972 Dr. Carl Sagan came up with the Pioneer Plaque for the Pioneer Nasa Misson in order to explain “us” to aliens, if they should catch somehow the spacecraft. What’s on it beside man and woman can be read on Wiki. What would you draw in order to explain human mankind? In the Star Trek novel Federation, a character mentions that humans had shown copies of the plaque to several alien races they encountered, but none had been able to decode it. We are not surprised. However, check out this article on “How to communicate with aliens”.