While this is taken from the philosophy of G.W. Leibniz, it represents a kind of late-medieval/early-modern periodic table, with the four elements at the cardinal directions, and the four states between, along with their relations. What’s interesting is that we still believe in binary relations (attract or repel) and four fundamental states of matter; we just call them liquid, solid, gas, and plasma rather than … Continue reading I’m in love with Schrödinger’s cat