The sculptor walked into the studio one morning and heard four students discussing the differences between subjectivity and objectivity. He took a large stone from the store, placed it on the floor in front of them and asked, "Where would you consider that stone to be, inside your mind or outside?"
One of the students replied, "Since it is impossible to experience anything without having an opinion about it, objectivity is an illusion. Therefore its existence is subjective. To have any reality it can only exist in my mind." The sculptor picked up the stone and tapped him lightly on the head with it. "Now where is it?"