A while ago now, I began my exploration of the nature of reality with a description of three different realms of reality that might exist. One of these was the abstract realm, inhabited by abstract objects such as numbers, propositions, and properties. (And I gave my reasons for thinking that the abstract realm does not actually exist.) Another was the physical realm, consisting of stars, planets, and biological beings in space and time. (And I gave my reasons for thinking that the physical realm does exist, and that we can learn about it through science.) The remaining realm that our experience reveals to us is the mental realm. This is the realm that conscious experience itself resides in, with all the thoughts, concepts, mental images, and so on that go along with it. And it is the realm where the entities that have conscious experiences exist: minds. The question of whether the mental realm exists is therefore a highly important one, not only for understanding the nature of reality, but also for understanding ourselves. This is the question that I will explore in the next