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And the world is termed nature,* when it is regarded as a dynamical whole--when our attention is not directed to the aggregation in space and time, for the purpose of cogitating it as a quantity, but to the unity in the existence of phenomena. Time and space are, therefore, two sources of knowledge, from which, a priori, various synthetical cognitions can be drawn. Space, therefore, cannot be regarded as absolutely and in itself something determinative of the existence of things, because it is not itself an object, but only the form of possible objects.