Remember Gaudi’s catenary models? His buildings were designed upside down. Each year I hang a chain in front of my students, and tell them about Gaudi, and about each link being in equal tension as each voussoir in a catenary arch is in equal compression. And now I learn of Carolina Fontoura Alzaga, who is recycling bicycle chains to make chandeliers guaranteed to rip the plaster straight off of your ceiling, if you don’t fix them to a joist. So often the results of recycling bicycle parts are pure unmentionable tack, that I am stopped in my own tacky bike tracks, to see something truly sublime. From now on I will be doing that demonstration to my history class, using a bike chain.