RFID in home use
Timo Arnall has kindly published an interview on his "Touch" -project, detailing how he sees the everyday world, augmentable through metadata on objects themselves.
The difference between touch-based augmented reality and traditional augmented reality is the same as with object-oriented programming and procedural programming: in the former you associate data with objects; with the latter you have a single control point through which all information flows. Adding objects that can describe themselves is a far more scalable model. (Yes, I know I am slightly misusing the term "augmented reality" here, which usually requires 3D registration, but I have no better term yet.)
That's also the cool thing about NFC-based systems compared to RFID: you can embed way more data on an object than just a simple identifier. This allows objects to become independent of some huge database out there on the web, while at the same time taking advantage of it, if necessary.
For example, you could embed short descriptions, and then add Google queries on the same tag to get access to a live document, if necessary.
"Tangibility." I like that word. Rolls of the tongue in a vague, yet nonthreating way :-)
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