Rumseld famously classified the difference between known unknowns and unknown unknowns; Zizek typically uses Rumsfeld as a jumping-off point to elucidate the co

Rumseld famously classified the difference between known unknowns and unknown unknowns; Zizek typically uses Rumsfeld as a jumping-off point to elucidate the concept of unknown knowns. (Though I think Zizek means it more in the sense of belief systems, norms, and ideology, in the vein of "can't tell a fish about water"; whereas Polyani seems to refer primarily to genetic instincts, subconscious cognitive processes, motor skills learned prior to language, etc.)