The terms “idealism” and “idealist” are by no means used only within philosophy; they are used in many everyday contexts as well. Optimists who believe that, in the long run, good will prevail are often called “idealists”. This is not because such people are thought to be devoted to a philosophical doctrine but because of their outlook on life generally; indeed, they may even be pitied, or perhaps envied, for displaying a naïve worldview and not being philosophically critical at all. Even within philosophy, the terms “idealism” and “idealist” are used in different ways, As an incredibly calorically expensive organ, we depend on our brains for a lot of what we do. For example, while we colloquially say that we see through our eyes and smell through our noses, really we perceive the world through our brains’ interpretation of the information received through other organs. This interpretation means that we are not necessarily experiencing an objective relative. Rather, we experience what we expect to sense.