This is cool. I guess with high density QR codes, a decent display and a good cam you could transfer a megabyte or more in a minute :D If both devices have fro

This is cool. I guess with high density QR codes, a decent display and a good cam you could transfer a megabyte or more in a minute :D If both devices have front facing cameras, such as smartphones, you could even have a real-time back channel (duplex), and the receiving device could signal the sending device that a certain "frame" got lost and needs to be retransmitted.