There's a big difference between the external world (objective reality, the realm of forms) and the internal world--which have been called in many different ways, the mind, the self among others. Why is this important? In postmodern world where people purposely blur the distinction between the domain of forms and the domain of non-forms, it becomes important to observe these 2 seemingly opposite worlds. "Seemingly opposite", because that is not the accurate way of thinking about it.