Just wanted to share a few pictures and videos of my latest work-in-proress...
It basically uses a cheap laser module to paint
greyscale redscale bitmaps on a wall or other suitable screen. To reveal the image you must use an SLR camera to take a long-exposure of the projected area the above image link shows this mechanism projecting the famous arduino infinity logo.
There's a couple of videos on there and some more pictures to follow soon once I've got all the bugs out.