Rare unique issue of recordings of Klein's lectures 'The Evolution of Art Toward the Immaterial' & 'The Architecture of the Air'. One of an edition of only 500 numbered examples - this one being number 298. Beautiful Klein blue gate-fold sleeve, with a portrait of Klein on the inside taken by Pierre Descargues. The recording includes a short passage of Klein's 'monophonic symphony" which originally lasted over 40 minutes. Gorgeous gold & black labels on both disc. Cover has a crease on the lower corner. Some creases also on spine. very light yellowing on inside. Labels Perfect. Disk 1 side 1 has a few surface scuffs, other sides perfect. A VERY RARE ITEM - AVAILABLE TO BEST OFFER.