The Blind Watchmaker?

The person who "knew" how to design a van did it based on the accumulation of prior knowledge handed down from engineers prior. 2008 model vans compared to 1982 models look very different, and, in a sense, unique.But, if you were to follow the change of van models from 82', to 83', and so on, you would generally see gradual changes to the van's design.I hope this helps.