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 website is its own, singular thing. We know it isn’t a book, a TV show, a film, or a song, but our language is limited to talking about it in those restrictive boxes. A website is a mix of all of those things, and none of those things. It is influenced by place and time. A website changes with age. It can evolve and regress.
It was then I wondered if the problem wasn’t that web design lacked its own Emigré. What if we actually lacked a shared language to critically discuss web design? Art, architecture, and even graphic design, have critics and historians that give context to new work through the lenses of culture and important work from the past.