This is a question that the artist Nickolay Lamm wanted to answer. With the help of Astrobiologist M. Browning Vogel, he launched a number of images representing just what wi-fi would look like if it turns out to be visible to the human eye. Of course these are only virtualisations based on wifi signals, so 2.4ghz and 5ghz, If you could actually see radio waves with your eyes the result would be somewhat different.