The Dutch Architect Aldo van Eyck (1918-1999) built with a social purpose. His most famous building is maybe the Amsterdam Orphanage that influenced school building around the world with its integration of smaller pavilions to form a small town as a building. He had great attention to in-between spaces that could be occupied in endless ways by the kids.
One of his often overlooked achievements was building around 700 playgrounds on vacant lots in Amsterdam in the 40s and 50s. Up to 90 of them can still be seen today.
Gardending Superfund Sites is an art project that fosters discourse around the issues of nature preservation, industry, and activism. Information and workshops with students and community groups to create a call to action to high tech industries to take responsibility for their actions.