From a cache of ancient drawings of Atari's early concepts of how arcade games would look like, and how people would interact with them, found here:
http://www.safestuff.com/
Complete with actual "70s consumers" action figures.
It's interesting to note that their concept of how arcade games would work was pretty much accurate; there are drawings of arcades, games at bowling alleys, etc. There aren't many details about this collection but it's fascinating to look at. And sad to think that the whole arcade game era is pretty much over, replaced by home consoles, PCs, etc. Sad if only for the fact that some games really demand their own controller, not just a direction pad and 27 buttons or however many buttons they're sticking on controllers nowadays.