Within the cycling community, activism may take many forms, and may include creative and practical approaches. These include bike-related music, bike-related films, international exchange of hospitality (Warm Showers), organized bike rides (often noncompetitive—i.e. Critical Mass and World Naked Bike Ride), art bikes displays, printed-word materials (such as blogs, zines and magazines, stickers, and spoke cards), and the publication and distribution of books (such as: Thomas Stevens's "Around the World on a Bicycle", Mark Twain's essay "Taming the Bicycle" and H. G. Wells's novel "The Wheels of Chance)". There are hundreds of bicycle cooperatives offering spaces for cyclists to replace their own bikes and socialise.