Kant confidently concludes that his system of universal interaction is certainly (certe) better than the pedestrian theory of physical influence. The reason, he explains, is that universal interactivity (systema universalis substantiarum commercium, 1:415.40) reveals the origin of the connection governing things, an origin that completely escapes ordinary physical influence because this theory looks at substances in isolation (1:416)—ignoring what happens among them, the dynamic “between”.