ABSTRACT
In his Discourse, Descartes went on to doubt everything he could. This piece of the history of philosophy is so well known that there is no reason to recount it thoroughly. One curious detail is that Descartes’s methodological skepticism included the mind-external bodies. Considering Cartesian physics and metaphysics, bodies are roughly equated with extension and hence with space. In other words, Descartes could doubt the existence of space. Jan Forsman (2021) has shown that Descartes’s skepticism was serious. He rigorously questioned what could be questioned. But it did not cross his mind to doubt the existence of time. Even while doubting or dreaming, time marches on.1
