I thought from the headline it might be a case of hearing broadband modems (I tend to be able to hear when my home one is more/less active) but this is more inv

I thought from the headline it might be a case of hearing broadband modems (I tend to be able to hear when my home one is more/less active) but this is more involved and is genuinely listening to the WiFi (my modem noises are not really the WiFi itself). Reminds me of a visualisation project from several years back: https://www.thisiscolossal.com/2011/02/visualizing-wifi/ https://www.thisiscolossal.com/2011/02/visualizing-wifi/