The best tools feel like extensions of the hand--or of the mind. When a craftsman shapes material with a tool, the tool is not the locus of his attention, the work is--or should be. A tool that we have to pay attention to--or that we have to shift attention away from work to operate, is a poor tool. McCullough attacks this question of how digital tools can be an extension, and not an interruption, of our work. With digital mediums we are manipulating bits, not atoms. How may tacit and kinesthetic knowledge find a useful place in digital creation and control? Tools too often "get in the way," rather than multiplying effort. There is much here to apply to the tools we create as well as the tools we use. This book is a very thoughtful treatment of the road to technological craftsmanship.