In optics, a caustic is the envelope of light rays reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface. The caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of rays as a curve of concentrated light.
A piece of milled plexiglass acting as a projecting lens; via the Computer Graphics and Geometry Lab at the École Polytechnique Fédérale de Lausanne
New milling techniques applied to glass and plexiglass panels could be used to “create windows that are also cryptic projectors, summoning ghostly images from sunlight.”
[Pauly and Bompas] hope that the technique will be used in architectural design, to create windows that mould sunlight and throw images or patterns onto walls or floors,” which, if timed, milled, and manipulated just right, could produce a slowly animated sequence of images being projected by an otherwise empty window during different times of day.
To control the shape of a caustic pattern generated by a specular or refractive surface, we need to solve the inverse problem: how can we change the surface geometry, such that incident light is redirected to produce a desired caustic image?
A businessman finds a fisherman, who is living an idyllic, peaceful life by the sea.
He laughs and tells the fisherman how to get rich instead.
The fisherman asks him what he will do after he gets rich.
He replies that he would retire to an idyllic, peaceful life by the sea.
There's supposed to be a deep life lesson in there, but it's always felt insincere to me.
To me it is better to have reached the heights of a career, or suffered an epic defeat, even if I do end up in the same place as everyone else in the end.
To me simplicity is made more beautiful when understood through a long personal struggle with complexity. When I can dance with it, having turned a mighty nemesis into an old friend, and teach others to do the same.
Better to have loved and lost, than never to have loved at all.