For the agreement of the above form of sensuous intuition, which is called space, with the faculty of concepts, namely understanding, not only leaves it inexplicable why it is this particular form of agreement and not some other, but, in addition, produces an expansion of the mind in which it suspects, so to speak, the existence of something lying beyond the confines of such sensuous representations, in which, perhaps, although unknown to us, the ultimate source of that accordance could be found.