caustics
Caustic (optics)
Caustics made by the surface of water.
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.
Hiding Images in Plain Sight
An Article by Matt FerraroI recently made a physical object that defies all intuition. It's a square of acrylic, smooth on both sides, totally transparent. A tiny window.
But it has the magic property that if you shine a flashlight on it, it forms an image.
Caustic Engineering
An Article by Geoff ManaughA 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.
Architectural Caustics
A Research PaperTo 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?
Ruins, Rub-outs, and Trash
Tracing paper into palimpsest
Kahn's preferred medium was charcoal. He liked to use the side of his hand to rub out the thing he was drawing in order to draw it over, and over again.
Turning the tracing paper into a palimpsest; where some trace of each previous marking is still there, only blurred out and faded back by Kahn's rubbings-out and re-renderings, so that in what he made there is also the record of how it was made.
Charcoal on trash collected over time acting as ersatz animated film recording how Kahn's ideas developed.
So insufficiently palimpsestic
I worry that unlike Kahn's process and tools, the processes and tools we use are aimed at helping us satisfy the demand for moving fast and breaking things, not to be good, or to better ensure the doing of good work.
My son Gerrit told me about a YouTube video from a conference where the presenter asked for a show of hands from video game developers in the audience who could produce or successfully compile their own code from the previous quarter. Or from the previous year. Or from two years ago. And by that time the point had been made: nobody had their hand in the air.
Good for the next man
Lou Kahn said that a house is only good if it's good for "the next man."
He knew that the likelihood of its spaces and places continuing to be loved after "the first man" has come and gone requires the kinds of attention to detail you'd have to be paying if the next man and the next-next man were embraced as stakeholders from the onset.