 The fourth topic follows on the heels of the third: what is the content of our idea or representation of space and time? From Kant’s point of view, the content of a representation might provide us with a guide to its possible origin. Alternatively, we might be able to consider the origin of a representation as providing us with a clue as to what its content might be. In the case of space, there may be reason to think that the content of our representation must somehow reflect what we know about space from Euclidean geometry.