on a related subject: When I was very little, my dad took 4 Lego's and made a very tiny "spaceship" for me. I don't know why, but it lasted 30 years. I never took it a part as a kid. It was something that was always there, together, when I dumped out my Lego bin. To this day my parents still have it. My dad actually has it on his desk.
I made a very similar ship a few weeks ago for my son with his Legos. I told him to play with it forever and to never take it a part :) I then showed him "mine" at his grandparents house when we were visiting, he loved it.