A recent study at the University of Minnesota suggests that ceiling height affects problem-solving skills and behavior by priming concepts that encourage certain kinds of brain processing.

"Priming means a concept gets activated in a person's head," researcher Joan Meyers-Levy told LiveScience. "When people are in a room with a high ceiling, they activate the idea of freedom. In a low-ceilinged room, they activate more constrained, confined concepts."

http://news.yahoo.com/s/livescience/20070508/sc_livescience/ceilingheightaltershowyouthink

This is why it's important to keep a sense of imagination. People feel confined and their IQs drop to match those of (freeze-dried) sandwiches. This is why every aspect of our society fails the same way. Keep your imagination active, and there are no ceilings, and you can create without having to fall into step.