A while ago I was trying to find realistic examples of what WiFi "looks like", to try to get an intuitive sense of how it operated in a house or outside a building -- to what extent it spreads in the same way as a normal lightbulb, or to what extent its vastly larger wavelength complicated the picture.
At the time, literally the only visualization I was able to find was this artistic seemingly nonsense:
https://inspirationist.net/what-wifi-looks-like/
So I'm very happy to see this tool. I'd be even more curious to see a non-animated version that lets you drag your router around and see "illumination" of the overall signal to see how it changes, continuing to take into account how reflections confuse and degrade the usable signal, etc. Instead of the animation of slow wave propagation. Maybe that exists somewhere?