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"Really" / Hacking: initially the word corresponded to unspecified mere likeness, later there schould be various several types of representation systems.
Reality / Hacking: Thesis: our ideas of reality are formed due to our ability to change the world. When we truly accept what we can use to change the world, or what the world can use to change us.
Einführung in die Philosophie der Naturwissenschaften Stuttgart 1996