For those less familiar, or more curious, a solid starting place would be Eileen Tabios' excellent profile of David's work in the third installement of Galatea Resurrects, where Eileen, in a sentiment echoing my own, refers to David's "rubBEings" as being "among the most moving, evocative and conceptually-sound art works I've witnessed /experienced". Also highly recommended is Geof Huth's interview-article on David, to be found also in OTOLITHS.
This video was available before, in an altered state, and was shown on public television if I understand correctly, but The Continental Review thinks it necessary to be giving it another, and perhaps wider, airing. The wonderful thing about the piece, and the reason that Gwen Wojcik, Benjamin Clark, Matthew Miller and Kelly Poindexter have done such a wonderful job, is that we see nearly all aspects of David's creative life presented as a more or less harmonious ensemble. There is no erected barrier here between the making of rubbings or clay-prints and the reading of poems or stories; no false cloistration of quiet composing from the outside wanderings in search of meaningful debris.