The problem of perception and the no-miracles principle

The problem of perception is the problem of explaining how perceptual knowledge is possible. The skeptic has a simple solution: it is not possible. I analyze the weaknesses of one type of skeptical reasoning by making explicit a dynamic (or diachronic) epistemic principle from dynamic epistemic logic that is implicitly used in debating the problem, with the aim of offering a novel diagnosis to this skeptical argument. I argue (i) that prominent modest foundationalist responses to perceptual skepticism can be understood as rejecting the dynamic assumption made by the skeptic, (ii) that there are independent reasons to doubt the truth of such a principle in the context of skeptical reasoning, and (iii) that making the dynamic principle explicit allows for a better understanding of at least one objection to modest foundationalism.