Kant realised that he had to deal with empirical phenomena, and pointed out that it is the spontaneity of our intellect which synthesises and confers conceptual objectivity upon empirical phenomena. (faith.org.uk)
As such it ranks far higher than fantasy, or «fancy,» which «is indeed no other than a mode of memory emancipated from the order of time and space, while it is blended with, and modified by, that empirical phenomenon of the will.» (religion-online.org)