This is a great exercise! Oddly enough, it’s what we do every moment without conscious awareness.
The bottom line is: "your subjective world causes your physical experience” … in other words You Create Your Own Reality (YCYOR)!
“For an exercise, then, imagine for a while that the subjective world of your thoughts, feelings, inner images and fantasies represent the “rockbed reality” from which individual physical events emerge. Look at the world for a change from the inside out, so to speak. Imagine that physical experience is somehow the materialization of your own subjective reality. Forget what you have learned about reactions and stimuli. Ignore for a time everything you have believed and see your thoughts as the real events. Try to view normal physical occurrences as the concrete physical reactions in space and time to your own feelings and beliefs. For indeed your subjective world causes your physical experience.”
(The Individual and the Nature of Mass Events, Session 830)