Computational Caustic Projection: http://physicstoys.blogspot.com/p/physics-toy-store.html An image is formed by refraction through a free form lens in a new process that utilizes the physics behind how light is concentrated into caustics. This molded acrylic has slight but precisely constructed surface of curves that when lighted by a broadband light source (Maglite flashlight bulb) projects an image of a lion onto a plane. This is not a hologram, but instead a new proprietary light redirection

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It's paramount for finite volume... Computational Fluid Dynamics (CFD) methods using the right mesh, physics, and cell sizes to accurately capture these tip vortices without which the estimation of rotor performance is difficult. Source: SIEMENS | Hangar 2