It's still cool after all these years. But now you can design it in Photoshop! Are you a beatnik? Is there such a thing as art jamming? You can see it on National Educational Television, along with David Susskind's talk show, Brian O'Dougherty on art, and yes, Julia Child on "The French Chef." You watched the flickering grey tube, no dark black and no white, thin angled interference lines through it and the horizontal hold jittering. And then you turned it off, and the image dwindled to a little bright spot in the center of a grey screen, lasting for minutes before it finally faded out.