Spectacular colors | Aurora Borealis Observatory

Aurora Laser Projector: caustic refraction clouds- red, green, and blue laser elements are refracted through a rotating optical element with lumpy surface features which create this amazing aurora/nebula effect. When light rays refract through a curved surface they concentrate into bright patches called caustics, often with cusp singularities (sharp points) and intricate threads of shadow. ➡ Follow the link in my profile for info on where to get this and other amazing items featured here on @phy