Visual Frequency Identifier (VFID)

I'd like to coin a new phrase today: Visual Frequency Identifier (VFID)

It's when you use the color of an object to identify the object. It eliminates the need to embed any special chip in the object (as needed in RFID). And, it's very easy for people to read the VFID of an object. It doesn't uniquely identify objects, but it does let you use any item you have laying around as a token. So if you have a bag of m&m's, you have a full set of computer readable tokens that can be used as input to a system.