Je retiens "Dichroic films" le rendu est sympa en photo
Dichroic films work with thin-film interference, with the wavelength of light passed through the film changing depending on the angle of incidence. Thus, as the observer’s viewing angle changes, the apparent color of the film changes, too. It creates particularly beautiful effects when several layers of film are laid on top of each other.
via Hackaday : lire l’article source