By tracking the movement of the device with a long-exposure camera - Hernan literally walks around with the device or swings it around his body - wireless signals are registered on film as ghostly streaks of multicolored light.
"The device is moved through the space, which is then registered in a long-exposure photograph," Hernan told Discovery News. "This process lasts for several minutes, and due to the brightness of the device, my figure is ghosted away in the process. In some pictures you can see my feet or even my blurred head underneath the light strikes."
Hernan's evocation of ghostly images and spirit photography is entirely deliberate, and intended to provoke thought about invisible energies in the environment.
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"I believe our interaction with this landscape of electromagnetic signals ... can be characterized in the same terms as that with ghosts and spectra," he writes on the Digital Ethereal project page. "They both are paradoxical entities, whose untypical substance allows them to be an invisible presence."