Amazing how difficult it can be to explain something like this iPhone app, when all you have to do is look at the picture and it’s clear in a second. The app displays blinking lights which, when swung like so, create what they call a “POV effect” but I would call… something different. Like the light graffiti we’ve seen about twenty times all over the internet, but with slightly more purpose.
It should work with regular eyeballs and not just a long exposure, and you can put up some graphics as well as text. You’re limited only by your imagination — and some other stuff.
You can get the “Light Writer – POV Effect” app just like you would any other, and it costs a buck. Man, a dollar don’t buy what it used to.