In Rainbows End, electronic devices all have several MEMS-aimable low-power lasers for high-throughput dynamic networking. Some folks at Sejong University are working on line-of-sight infrared laser power transmission. This will need dynamic aiming in order to be usefully deployed, but can start out in easy mode of connecting with other devices that don't move or move rarely and then gently climb the challenge curve up to tracking moving hand-held and worn devices. Meanwhile, it will be easy to modulate the power beam for a moderate-bandwidth communication channel, or later add higher frequencies to the beam for ludicrous bandwidth.