Here's an idea I came with at least 8 years ago and wanted to develop further but in the end never managed to. I'm not aware if someone in the meantime made som

Here's an idea I came with at least 8 years ago and wanted to develop further but in the end never managed to. I'm not aware if someone in the meantime made something like that, however this article brought it back to mind. Basically it was a phone app that through mesh networking (Bt/WiFi) builds then maintains updated a distributed database of signed up local devices where each record contains accurate geographical coordinates (or seat numbers in public places - that would require a map of course) of all devices then arranges them in a xy matrix, rounding to the next available device when necessary. The initial purpose of the app, once the owner wears it like a pendant, was to make each device screen become essentially a RGB pixel in a giant screen, then distribute and synchronize (again, through mesh networking) down to fractions of a second (NTP and GPS should allow that) both graphical and temporal data to drive them. My idea was to use this giant screen to allow people to show political dissent messages in countries/times/places where this is not permitted (just imagine a 20k people crowd in a stadium). The app should have implemented some mechanism so that only trusted people could decide and schedule what's being shown and when, but other than that, every connection would have been on a peer to peer basis through mesh networking. I didn't think about implementing a chat over all the above, but that would probably be a lot simpler than the rest. As further security measure, the database should be encrypted so that if someone is arrested it won't reveal the peers data/position, and a panic button or dead man switch function could also be added so that a routine propagates the alert instructing all other apps to uninstall themselves and reboot.