I presented a paper called “Flexibility and its discontents: Colquhoun’s critique of the Pompidou Center,” at the 107th annual meeting of the Association of Collegiate Schools of Architecture (ACSA) — the conference was called BLACK BOX: Articulating Architecture’s Core in the Post-Digital Era — at Carnegie Mellon University, March 28–30, 2019. The proceedings have not yet been published, but you can read the paper here.
Stewart Brand’s revised diagram of time-based building systems, based on Frank Duffy’s categories, but with two more S’s and some changed names (“site, structure, skin, services, space plan, and stuff”), each with its own characteristic time-frame for repair, maintenance, or replacement (image by J. Ochshorn adapted from an image by Stewart Brand, How Buildings Learn, p.13, which was, in turn, adapted from an image by Frank Duffy)