I found this photo via two of my favourite tumblr blogs, breeapperley and self-romance. Mabel from self-romance tells me this is from the Swedish architecture firm Tham & Videgård Hansson Arkitekter, who are at the moment probably most well-known for their mirrored treehouse. There are more photos of this faintly surreal apartment at dezeen. This firm loves boxes in a lattice structure. They use them everywhere.