Douglas Harding is an enlightenment teacher who attained freedom in the Himalayas when he realized he had “no head.” As he famously puts it, “I lost a head and gained the universe.”
Headlessness is simply the childlike, experiential fact that we can’t see where This awareness is coming from. We’ve been conditioned to think it comes from our heads, but we’ve never seen this alleged “head” we’re supposed to have. We see heads on others, heads in mirrors, but strip away the assumptions, and all there is is a space on top of our bodies that experiences everything. There’s much more on the subject at: Harding’s website. Especially valuable is the collection of short movies which demostrate the headless insight and suggest some great practices for awareness.