In the processes of the brain, you are constructing a reality which we all experience. You should know it's outside. No. What does materialism say? This body is real, and in this body, in the skull there is a brain. So literally, if you take it literally, the experience which you are having of the world of the universe is here.
Swami Sarvapriyananda teaches Chapter 10 Verses 16-22 of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).