Steve Mann with his SWIM (Sequential Wave Imprinting Machine) invention:

Download high resolution pictures of all 15 frames of the above sequence (link) or browse selected frames (link).

11x7 version for talk slides:

Here's frame 1, and a cropped version of frame6:

Here's a still picture (not part of the above sequence of images), but it needs some colour correction (shot with a mixture of flash and tungsten incandescent light, with the camera's color balance set for flash only):

If the phone is facing toward the camera it might be easier to recognize that it is a phone (only part of waveform showing):

First attempt at taking this picture (background not dark enough):

More (link)