I would say that most of us in the LEGO community, at one time or another, have experienced the overwhelming compulsion to build something; from spaceships, to castles, to superhero figures, and of course, spaceships.  Or, if you're like WTyler, the National Mall in Washington, D.C.  Since his retirement from the video game industry several years ago, he's occupied his new-found free time with LEGO.  Crossword puzzles and golf just weren't doing it for him.