Seeing projects like this Basle Film Festival identity really get me excited for the possibilities of analog projections in my own projects. The creators of this project, Andreas Hidber (art direction) and Laurent Rueff (photographer) used a Nikon FA for the projection by removing the back of it and inserting previously developed slide film that contained the logo that you see on the wall.
To project through the camera onto the wall they used a flash pointed into the back of the camera while shooting on Bulb mode. This allowed them to keep the shutter open. In order to capture the projection they shot with a digital camera on the side. The most interesting part of this is that people aren’t likely or really able to view the projection.