Following Greenhouse Studies, Philippe Weisbecker's attention was drawn to other architectural structures, the ones visible on the outer walls of early 20th century industrial buildings. They are made of steel or concrete beams assembled together and holding an apparatus of bricks and mortar. Even though these structures may appear very similar for their overall shape, they differ greatly in order to ensure the weight distribution necessary to the stability of the edifice. The present portfolio is a sampler of some various structural beam combinations. It can be viewed as a book, spread by spread, or pinned on the wall, according to taste, the way a kid might stack up building blocks.