In a cool medium, the audience is an active constituent of the viewing or listening experience. A girl wearing open-mesh silk stockings or glasses is inherently cool and sensual because the eye acts as a surrogate hand in filling in the low-definition image thus engendered. Which is why boys make passes at girls who wear glasses. In any case, the overwhelming majority of our technologies and entertainments since the introduction of print technology have been hot, fragmented and exclusive, but in the age of television we see a return to cool values and the inclusive in-depth involvement and participation they engender. This is, of course, just one more reason why the medium is the message, rather than the content; it is the participatory nature of the TV experience itself that is important, rather than the content of the particular TV image that is being invisibly and indelibly inscribed on our skins.