This is an article in wired.com about concept drawings for NASA and other
The reason I bring it here, is to point out an example of where
non-working-prototypes are valuable total product lifecycle process.
The artist put it this way:
"Conceptual space art provides the initial glimpse at what could be," said
Rawlings. "It helps sell the program, it helps refine the mission planners'
sense of the mission's details, and it inspires both internal and external