Digital Paper
The dot pattern is a kind of two dimensional barcode; the most common is the proprietary Anoto pattern. In the Anoto pattern, each dot is spaced about 0.3mm apart; the full pattern consists of 669,845,157,115,773,458,169 dots, and encompasses an area exceeding 4.6 million km² (this corresponds to 73 trillion sheets of letter-size paper).
The complete pattern [...]