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Several similar devices followed, some backed by major companies like GE and AT&T. By 1928, Americans could pay for a mechanical “radiovision” kit from inventor Charles Jenkins, and tune in for thrice-weekly “radiomovie” pantomimes on his broadcast network.

The original concept for the BBC's breakfast programme was not Breakfast Time at all, but a TV equivalent of Radio 4's Today, something grandly titled "Radiovision", which fortunately never got off the ground.

Visual radio or, as he called it, radiovision, was explained by an enthusiastically earnest Patrick on the air that afternoon as a ground-breaking experimental system whereby listeners round the world could look at their radios and see the speaker talking to them.

For now, the Radiovision Festival is dedicated to exploring those connections: between creators and consumers, between old and new formats, between how we listened yesterday and how we’ll listen tomorrow.

The Radiovision Festival opens on Friday with a screening of the documentary “Radio Unnameable” at 7 p.m., at the Kraine Theater, 85 East Fourth Street, East Village; $5.