It is now known scientifically that a human being 99.999% space. And, whatever is thought to be physical is actually light substance (electromagnetism). This is exactly what meditation reveals to us too. Awareness is expansive, spacious, and vast. Within the space, illuminations, understandings, thoughts and other subjective “things” arise. All of them are classically termed “appearance;” which does not only designate something visual.
“Pure and total consciousness” is another way to phrase the pervasive luminous space of intrinsic Awareness.
meditation podcast: space and light