What is the fine-grained topic of the following text: P.S.1 developed directly out the history and practices of alternative spaces: in the 1970s, the strategy of the Institute for Art & Urban Resources, which Gordon Matta-Clark was closely involved with, occupied empty spaces in the city and made a major contribution in that period to a highly active and inspiring artistic climate. Only return the topic.
The history and practices of P.S.1 as an alternative art space.