"First is the sheer joy of making things...
Second is the pleasure of making things that are useful to other people...
Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts...
Fourth is the joy of always learning, which springs from the non-repeating nature of the task...
Finally, there is the joy of working in such a tractable medium..."
(Snippet from 'The Mythical Man-Month' by Frederick P. Brooks, Jr. [Chapter 1 - The Tar Pit])