Abstract

Thought experiments can be used in various ways. A part of them seems to have a special epistemic value: they can give us a new, unknown information about reality. One of the most famous thought experiments of that kind is the thought experiment of Galileo which demonstrates that two bodies of the same kind should fall with the same speed. However, an analysis of this argument shows that it is based on several ontological presuppositions. Therefore it's not the thought experiment itself that has a significance, but its correspondence to real experience.