Can effects double as causes? Kant, still working with some form of final causality, thinks so: There are cases when “the thing that for the moment is designated effect deserves none the less, if we take the series regressively, to be called the cause of the thing of which it was said to be the effect . . . . Thus a house is certainly the cause of the money that is received as rent, but yet, conversely, the representation of this possible income was the cause of the building of the house.”