The Ocean, the Wholeness, the Awareness

Aldous Huxley describes this reducing valve of awareness that our original nature is mind at large. This mind at large has to be funneled through a reducing valve of the brain and nervous system. He says what comes out at the other end is a measly trickle of the kind of consciousness which will help us stay alive on the surface of this particular planet. So it's possible to become mindful of that and reconnect or remember our original openness. How do we open our attention, it's kind of a foreground background to the space that everything's arising from? If everything changes, if everything changes, then what is really true? Is there something behind the appearances?