"Mind" and "Spirit" are the common English translations of Hegel's use of the German "Geist". Some have argued that either of these terms overly "psychologize" Hegel,[citation needed] implying a kind of disembodied, solipsistic consciousness like ghost or "soul." Geist combines the meaning of spirit—as in god, ghost or mind—with an intentional force. In Hegel's early philosophy of nature (draft manuscripts written during his time at the University of Jena), Hegel's notion of "Geist" was tightly bound to the notion of "Aether" from which Hegel also derived the concepts of space and time; however in his later works (after Jena) Hegel did not explicitly use his old notion of "Aether" any more.