Barcodes encoded in the angular dimension

But the new system uses a whole new approach, encoding data in the angular dimension: Rays of light coming from the new tags vary in brightness depending on the angle at which they emerge. "Almost no one seems to have used" this method of encoding information, Raskar says. "There have been three ways to encode information optically, and now we have a new one."

One of the better stories I've seen on the front page of HN in a while.  

Barcodes
are usually used to identify normally inanimate things.  When we have
things that have processing power, we normally go over other lines of
communication, such as wireless, to communicate between things.  But as human-computer interfaces get better and are more ubiquitous, we sometimes would want communications that are inherently proximity or interaction based.  A good example of this type of interaction is something like Bump technologies.  That way, standard cameras would be able to be used, and the information doesn't need to make a roundtrip to the server.

I imagine barcodes being more prevalent in everyday objects not only to tell the world of what it is, but how to interact with it, and the protocols that it accepts to talk to it.

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