This publication is a journal of permeable architectures. First, it gathers key concepts about permeability (absorbency, penetrability, flexibility, availability, exchange, circularity and convergence); these are called permeability angles. Then, it presents a catalog of diverse permeable phenomena, a collection of small case studies that allow us to understand permeability under different formats, Finally, it introduces a series of permeable projects designed by Plan:b that embody an architecture positioned by the acknowledgment of its ecosystemic condition.