This concept was highlighted by a quote I read by Steve Jobs' biographer Walter Isaacson:
"One of the most important things he taught Steve was [that] it's important to be a great craftsman, even for the parts unseen. When they were building a fence, he said, 'You have to make the back of the fence that people won't see look just as beautiful as the front, just like a great carpenter would make the back of a chest of drawers ... Even though others won't see it, you will know it's there, and that will make you more proud of your design.'"( source )
Now that I am using the Eclipse IDE for my work, I expect that making beautiful source code will be easier than ever.