Understood in this way, the mind hardly is anything at all: it is its aboutness. This makes the human mind (and possibly some animal minds) different from any other naturally occurring entity. Nothing else can be as thoroughly about or of things as the mind is: even a book only reveals what it’s ‘about’ to someone who picks it up and peruses it, and is otherwise merely a storage device. But a mind that is experiencing nothing, imagining nothing, or speculating about nothing can hardly be said to be a mind at all.