Digital Ethereal, designer Luis Hernan set out to capture one of these invisible signals, WiFi, using a creative combination of long exposure photography and an Android app.

Kirlian Device mobile app visualizes WiFi signal strength using a series of colors.

The resulting images reveal these invisible signals that Hernan says remind him of ghosts. From the Digital Ethereal project website:

“I believe our interaction with this landscape of electromagnetic signals, described by Antony Dunne as Hertzian Space, can be characterized in the same terms as that with ghosts and spectra.

 

They both are paradoxical entities, whose untypical substance allows them to be an invisible presence. In the same way, they undergo a process of gradual substantiation to become temporarily available to perception. Finally, they both haunt us. Ghosts, as Derrida would have it, with the secrets of past generations. Hertzian space, with the frustration of interference and slowness.”