What is it like to do philosophy? Here is an image. Imagine a rock on a calm sandy beach. The waves slowly wash up, caressing the rock, moving it around, pushing it away from the sea, then pulling it closer. The water surrounds all sides of the rock, gets into every hole and crack. The rock is surrounded by the water which it breaks. The water cannot get close to it without being broken by it. It moves the rock but the rock moves it. But the breaking of water is not like the breaking of glass: the water stays together even when it is broken. Holding something in mind as a subject of philosophical investigation is like a rock on a beach. The mind is the water and the subject of investigation is the rock.