(c) ("caustic design" or "caustic engineering") is fascinating to me. I'd never heard of this before, and it looks like it can even be done with real-world mate

(c) ("caustic design" or "caustic engineering") is fascinating to me. I'd never heard of this before, and it looks like it can even be done with real-world materials: https://lgg.epfl.ch/publications/2012/caustics/ArchitecturalCaustics_AAG.pdf https://lgg.epfl.ch/publications/2012/caustics/Architectural...