“the indecisive murmur of colors can present us with things, forests, storms—in short the world” Merleau-Ponty (1964/2001:294)In my book, Outside Color, I defend the idea that colors are not properties of either the objects we see, or of our inner mental states, but instead properties of the perceptual interaction between the seeing subject and the object viewed. This proposal invites the objection that colours appear to be stable, intrinsic features of things around us and thus cannot be properties of an inherently changeable activity. In this lecture I discuss how the apparent constancy of color can be understood according to my interactionist views. In particular, I will review some relevant findings from the psychology of color vision and relate them to a longstanding puzzle concerning our experience of perceptual constancies.