The Idea is the unity that falls into multiplicity on account of the temporal and spatial form of our intuitive apprehension; the concept, on the contrary, is the unity reconstructed out of multiplicity by the abstraction of our reason; the latter may be defined as unitas post rem, the former as unitas ante rem. Finally, we may express the distinction between the Idea and the concept, by a comparison, thus: the concept is like a dead receptacle, in which, whatever has been put, actually lies side by side, but out of which no more can be taken (by analytical judgment) than was put in (by synthetical reflection); the (Platonic) Idea, on the other hand, develops, in him who has comprehended it, ideas which are new as regards the concept of the same name; it resembles a living organism, developing itself and possessed of the power of reproduction, which brings forth what was not put into it.