We may believe that there is an external reality that comes into our consciousness by the means of our perceptions. And we may believe that our perceptions are accurate. We cannot 'objectively' prove or confirm any of this, however. It all takes place deeply inside the head of the perceiver. Accepting that there is objective reality is a subjective, conscious conclusion. In 'reality', all of our talk and discussion of what we share is poetic at most, a very gross approximation of our internal state.