7 Works collects recent Sierra projects realized in a range of locales–India, Mexico and Venezuela–between 2005 and 2007. It includes the controversial 21 Anthropometric Modules Made from Human Faeces by the People of Sulabh International project, for which human feces were collected in New Delhi and Jaipur, dried for three years, mixed with an agglutinative plastic and dried in molds to produce the final sculptures.