Dutch Parasite

It's a cool little green house –


– but it's also a "parasite" built "to exploit scarce urban space in an innovative manner."
This and other parasites use "unusual urban situations" to "create new forms of habitation by developing lightweight, flexible, low-cost structures that could be installed in left-over spaces where services and access already exist or are near at hand. The present prototype [above] is connected to the water and electrical supply of the Las Palmas building [in Rotterdam]. The form of the structure was determined by the lines of access and services in the 'host' building, by the existing structural parameters and the architects’ aim to achieve a sculptural appearance."
Meanwhile, you can also build such structures in New York: "All it takes is a building permit."