Every single James Dean’s blink was collected from all of his movies. Then, the 951 blinks were aligned together, creating a video of several sequences of smooth spins of his head.
A projector installed inside the wall projects the video, that glows through the skin of the wall. When the viewer approaches the wall there are no marks, hole, or any sign of modification on the wall, but the very tiny video (about 2 x 1.5 inches, or 5 x 4 cm.) that is running, with no traces of the technology that makes it possible.