IBR Roomba Swarm in the Dark I Part of a "Roomba Art" picture series produced by Tobias Baumgartner, Marcus Brandenburger, Tom Kamphans, Alexander Kroeller, and Christiane Schmidt of the IBR Algorithm Group and Braunschweig University of Technology.
Roomba art is made simply by attaching an LED light to the top of your Roomba vacuum cleaner and letting it do it's business of running around your room in random fashion, twirling at times, cleaning your floor.
A specular holography company. Not really a hologram, but a bunch of arc scratches made in plastic (usually). This had to be done mechanically, with a computer, but I have never seen anyone do anything this advanced.