By inquiring the historical records, we can clearly know that the earliest steamboat was invented by Joe Frye of France. As early as the Tang Dynasty in China, a man named Gao Li invented cars and ships. The ship's historical mind map can be drawn from the Tang Dynasty.

Mind map is a kind of chart that is expressed by graphics, lines and words, with strong logic and clear subordinate relationship between higher and lower levels. Mind mapping has various forms, and conventional mind mapping is just a graph like that tree diagram.