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Yeah, I've thought of this too. I was thinking you could just use a normal mobile network, as you'll just be sending the correct color to a full screen (not a ton of data needed for that). I was thinking that a website serving up web socket connections would be the best way to send the data, no clock sync needed.

Just spin up $10K worth of AWS instances for a few hours to handle all of the connections, and done.

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clock sync is far easier than sending data. Once the clocks are in sync the demo just runs. If you think the clocks are going to drift just sync them every 10 to 20 second.

Example: This demo runs on clock sync. In general no data is sent between the machines. They are running independently. They just happen to be using the same clock.

https://www.youtube.com/watch?v=64TcBiqmVko

When the camera changes that is sent to each machine (ie, change your camera to ...) but then it's back to no communication.

Use 20000 phones each with a much smaller view and you'll get the same thing.

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