http://thefuntheory.com/
This website has examples of creative methods people have used to change behavior. One idea was to make a staircase with piano keys for stairs, encouraging people to skip the escalator. Another approach was to install a speaker in garbage cans that makes a sound of something falling down a deep pit, encouraging people to dispose of trash instead of littering.
They make boring parts of life fun and healthier.
What kinds of ways can we make sustainable practices fun for people?
