Radio flyer

In Chicago, I lived in an art-deco high rise that still had wall-hangings of its original ads.  The catchphrase I'll never forget:  "Efficient as a Zipper!"

We tend to have short memories when it comes to revolutionary technology.  The telegraph, radio, black-and-white TV--these may not seem revolutionary now, but back in their day they were arguably more revolutionary than the internet or web. 

Why?

Because folks had never seen the like before.

Below, an old magazine ad that presages Marshall McLuhan's observation that the electronic era ushered in an age of all-at-onceness: