forehead input

I'm repeating an idea a friend's friend apparently implemented long ago. But I think the idea is still awesome now, and it makes me want to hack together something electrical.

The idea is a "screen" you put on your forehead that essentially uses your skin as a retina, and each "pixel" pokes the forehead there with a mild electric shock.

And apparently this worked.

It could "show" the time, and weather, and whether someone is behind you. Maybe friends could send messages to your forehead.

And I'm bald, so I could have an even larger "display".

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