Another example of volumetric projection / fog projection is Anthony McCall’s “solid light sculptures”. He started back in the 70s with film projection and has more recently been using digital projection into haze. The projected content is generally simple geometry that is extruded along the cone of projection into a three-dimensional shape. Here’s his first piece, screened for this doc about 5 years ago: https://vimeo.com/29428835
Amazing writeup here. Thanks for the resource!