I could write a book about AT&T/Bell System promotional videos of decades past. Most of you have probably never seen any of these. AT&T appears to have killed their "tech channel" site that hosted a range of them, but their YouTube channel is still up.

So let's begin with their 1974 psychedelic pitch to elementary school children: "Telezonia". I won't even try to describe it any more than that. Just be sure that you're sitting down. - ttps://www.youtube.com/watch?v=YNxJPYP-ajQ