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The main purpose of this paper is to contest the Aristotelian notion that the objects of metaphysics, mathematics and physics are all abstract, which is the reason why these disciplines constitute a homogeneous class. For a reflection on the way how objects are introduced into scientific discourse leads to the conclusion that some of these objects (especially the mathematical ones) are fictions of reason an that their nature is defined purely by their mutual relationships. From this it follows that, far from being theoretical sciences, the respective disciplines are justifiedly classified as arts.