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?
Radić's texts are almost always assemblages of several pieces or paragraphs that, although written by an architect, do not attempt to refer to a particular project or work (and if they do, it is always laterally, avoiding explanations of the how and the why, or demonstrations and apologies).
Like notes from a fragmentary diary or a review of a collection of memories, at times they share the melancholy tone of the writings by Aldo Rossi and at other times they recall the obscure density of John Hejduk's poems.
There are places I will never go. Due to laziness or boredom, or premature fatigue. But there are also landscapes or buildings I should have visited a long time ago. This text reviews those possible places. All of them are part of my story, and they are places I am familiar with in one way or another.