Bokode tag, visible to out-of-focus cameras
 

MIT announced a new kind of barcode tag (now using LED, but later using holograms) that uses the Bokeh effect to let users use cameras focused at infinity to read far more information off the tag than is possible with traditional barcodes.

Bokode: Imperceptible Visual Tags for Camera Based Interaction from a Distance

Shayne Weyker
Weyker Video