The Summer School of Architecture is taking place in Motovun for its thirty-third year. Organized by the Faculty of Architecture at the University of Zagreb, it brings together quite a number of people from around the globe. It has many international sponsors, as well. Today I heard a lecture by a representative of an Austrian firm specializing in building materials. It is one of the school’s leading sponsors. Among other things, he mentioned that his firm does not use nanomaterials like some of its competitors. As it has turned out, nanoparticles are carcinogenic, just as asbestos turned out to be several decades ago. No-one in the audience reacted to this aside, but I left the auditorium as soon as I could. It had never crossed my mind that nanotechnology could play any part in the rough-and-tumble of the building sector, but I would have thought of cancer as soon as the connection crossed my mind. Tiny as they are, nanoparticles cannot but be carcinogenic. How could anyone ever think of using nanomaterials on a building site? As far as I am concerned, this is nothing but yet another proof of human stupidity. Sadly, such proofs have been piling up as of late to the point of being entirely superfluous. “Enough,” I feel like shouting at the top of my voice. “We get the point!”