The mirror in which these interactive propositions are reflected allows ephemeral compositions made of real movement and unstable structures. The trihedra, where balls in reflection are set in motion by the viewer, the prisms in truncated pyramid, which recreate a virtual sphere, date from the years of Visual Art Research Group. More recently, installations of the "sundial" type reconstitute shadow and light in movement or destabilize the path of a light ray.

http://joelstein.free.fr/html/objets/objets.html (08. 06. 2020)