Some of the stuff they make for the Burning Man festival is incredible. Wife and I have been wanting to attend one for years now. I suggest looking up Burning Man and check out some of the images - be warned however some are of adult content. The Burning Man is an annual gathering that takes place at Black Rock City—a temporary community erected in the Black Rock Desert in Nevada. The event is described as an experiment in community and art, influenced by 10 main principles, including "radical" inclusion, self-reliance and self-expression, as well as community cooperation, civic responsibility, gifting, decommodification, participation, immediacy and leaving no trace.
They construct a huge temporary city for a week and when they leave they take it all down (or burn it down) and leave nothing behind.
Here a few,
Some things are meant to be closed. Your mind isn't one of them.