LOOKS GREAT, BUT WHAT DOES IT DO?
I once read about a certain Mr. Wahlstrom who purchased an old bombsight and took it apart to see what made it work. As he began to put it back together, he decided to add to it some spare parts he had from other projects. Over time, friends and neighbors took an interest in the matter and started bringing him parts and pieces, which he incorporated into his contraption. Over a period of about ten years, he added to his machine hundreds of wheels and cogs, belts and whistles and gears and who knows what all until the thing became a marvel to behold. He would throw the switch, and the machine’s thousand parts would begin to move. Wheels turned, lights flashed, bells rang, and belts whirred. The device came to be known as "Wahlstrom’s Wonder." It was incredible. The only thing is: It didn’t do anything! It just went through the motions.
(Gene Bartlett, The Audacity of Preaching, 1962, pp. 64f.).