Is it universal? Listener question

Hi Clare. Hope you're well?  Just finished reading Well, and loved it. Thanks!  I've had a year out from reading 3P you're books but now seem to have got a taste for it again.  I'm now reading HOME and finding it pretty all-engrossing. Loving the humoured too😀. I have a question for you about universal mind/ consciousness. How do we know it's something universal rather than just a phenomenon of the brain that all brain owners have? I think about the space which is the gap between thoughts. It's a space of peace and ease. Is it universal though? Or just what my brain does when it's not doing its usual busy work? It's this spiritual 'universality' which I struggle with.