'What do we mean by 'no separation'?' Listener question

Thank you so much for all your wonderful courses. I know I'm not active in your groups but I listen to you every day and I'm loving the content.  Life is better but without really being able to pinpoint why or what's changed. I feel lighter, relationships are more content, and generally life seems to flow better. So thank you. I'm wondering if you can speak more about 'no separation'.  At first I totally didn't get this concept because to the eye everything looks separate- and I assume we can all agree that there is an apparent reality of separate bodies and objects.  Moving deeper in however, I'm beginning to understand the concept as in: nothing can exist outside of my perception- so moment to moment, life, and everything that happens, is being created from within me, and the life that this body-mind system is living is a playing out of its internal conditioning. Does that encapsulate it? Thank you PS. I know there's no 'I'.  It's just so cumbersome writing 'body-mind system' all the time- and is it necessary?!! x