That totally amazes me. It's not very common for a person to have the logic and reasoning to design many of the things he designed, but, then to also have the creative ability and artistic side to be able to sketch them. It makes me wonder if he had a close companion, (not that kind) but another kind, that perhaps he was able to work with or discuss things and ideas with.
I do know that it's so much easier to come up with things when you have someone who understands you and your ideas enough to be able to discuss them with them without too much criticisms and nit picking. It would be interesting to see just who he hung out with on a regular basis.
This blog here has some cool information on 15 Da Vinci War Machines.
