In the context of a housing shortage and a degree of political instability, May assembled a powerful staff of progressive architects and initiated the large-scale housing development program New Frankfurt. May's developments were remarkable for the time for being compact, semi-independent, well-equipped with community elements like playgrounds, schools, theatres, and common washing areas. For the sake of economy and construction speed May used simplified, prefabricated forms. These settlements are still marked by their functionality and the way they manifest egalitarian ideals such as equal access to sunlight, air, and common areas. Of these settlements the best known is probably Siedlung Römerstadt, and some of the structures are colloquially known as "Zickzackhausen" (zig-zag houses).