The document summarizes a tricycle house designed by PAO and PIDO as an innovative but not necessarily comfortable housing solution for overcrowded cities like Beijing. The tricycle house is made from an experimental folding plastic material that allows it to open up, expand its interior space like an accordion, or connect to other houses. It is powered manually and off-grid, with folding fixtures like a sink, stove and bathtub that collapse into the front wall. The designers experimented with cutting, folding and welding scored plastic sheets into the house's structure to create a portable yet durable shelter.