There is an image of an ancient tablet from Sumeria; which depcits the floor plan of a dwelling(?) available on the Internet. It is supposed to be over 5000 years old. It is quite fascinating to see how such simple tablet representation actually captures a lot more than the CAD drawings of our times. In this video I will try and convince why it is important to look at representation of architecture more like Sumerian tablets rather than like CAD. TAD is the software which can do this -- it is a lot more simpler; lot pithier, and can cover a whole lot of ground.
TAD is free. Get it from www.teamtad.com