Is the theory of sublimation—the idea of channeling sexual energy into creative or physical output—still considered valid? Is there evidence that it "works"? [more inside]
posted by Busoni on May 10, 2009 - 16 answers

Help me find a geometrical drawing by Leonardo da Vinci, of a "permutahedron" made of hexagons and squares. Does it appear in a book (or codex?) I can reference? Are there copyright issues? [more inside]
posted by Aknaton on May 1, 2005 - 5 answers