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?
I’m finding that many people not only have lowered their standards with regard to the user interface, but more and more often when I bring up the subject, they seem to consider it a somewhat secondary aspect, something that’s only good for ‘geek talk’. The same kind of amused reaction laymen have to wine or coffee connoisseurs when they describe flavours and characteristics using specific lingo. Something that makes sense only to wine or coffee geeks but has little to no meaning or impact for the regular person.
The problem is that if an increasing number of people start viewing user interface design as an afterthought, or something that isn’t fundamental to the design of a product or experience — it’s all just ‘geek talk’ — then there is a reduced incentive to care about it on the part of the maker of the product.