You should totally watch this video. Volkswagen is publicizing initiatives that get people to make changes for the better by having more fun doing everyday activities. The Fun Theory shows many of these projects, and also sponsors an award for the most effective of the bunch.
At a subway station in Stockholm, an amazing 66% increase in taking the stairs over the escalator was recorded, simply because the activity was made fun by adding musical notes to each step. This had the benefit of not only giving stair-takers some physical activity, but it also put big smiles on their faces.
Do you think about the fun theory when planning a space?