The need for more and more profound teachers because of the very medium of television is shdowed in the panel show, at least to the extent that it seems more natural, ever since radio, than a single source of comment and information. Two or more teachers in dialogue with each other and with class or audience created exactly that sense of lightl llthrough rather than light on, which is the nature of ht etelevision image or mosaic as c0ompared with movie or print. In the same way with the panel, the voice comes through the audience rather than to the audience.