 In his Encyclopédie article “Métaphysique”, Diderot also opposes an abstract metaphysics of time, space and being to a practice-based metaphysics: he suggests that practitioners such as musicians and geometricians be asked about the “metaphysics of their art”, which will yield promising results, just as in the Pensées sur l’interprétation de la nature he lauded the figure he described as the “manouvrier d’expérience”, a kind of artisan-experimenter whose practice has yielded, over years of experience, an artisanal knowledge.