This article by Paperhouses founder Joana Pacheco was originally published by Metropolis Magazine as "Aravena's Small Step, Open Source's Big Leap."

When Alejandro Aravena was awarded the Pritzker Prize earlier this month, he made a remarkable and significant announcement: he had published the plans of four of his social housing projects on his website, for anyone and everyone to study and use.

Through the work of his firm Elemental, Aravena is known for his interest in incremental, participatory housing design: a common-sense way of working within financial restraints and a cornerstone of Elemental’s studio work. The motto—focus first on what is most difficult to achieve, what cannot be done individually, and what will guarantee the common good in the future—resulted in a “half a house.” First introduced over a decade ago, the model consists of an expandable 40 square-meter (431 square-feet) container with basic infrastructure (partitions, structural and firewalls, bathroom, kitchen, stairs, a roof) built-in and added to over time. It is not only an achievement from a conceptual and project management standpoint, but also an aesthetically open and diverse project. From this one idea stemmed 100 variations.