Ordinary fog displays use a single projector with fog on a flat surface, but this display uses three projectors, each showing a different picture. So when the observer moves around the fog, they get a three-dimensional view.”
This system utilizes the fact that dispersion of light by fog has directionality. It projects different pictures, from different angles, onto a cylindrical fog screencom. In this way, the 3D form of objects can be recognized from the motion parallax, which is how the view of objects changes depending on the viewpoint.