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 used to work in Silicon Valley, and I’m aware of the things that, especially with games, you’re meant to do with people’s attention. You’re trying to capture as much of people’s attention as you can. So that involves things like endless play, or sending them push notifications, or asking them for sign-up information.
And philosophically, I enjoy doing the opposite of all those things, doing all the things that you are not meant to do, which I think has bizarrely had this effect where the game feels really human and just enjoyable. And that really resonates with where we’re at right now in the world and with COVID, and then also we’re trying to figure out, what is tech? What has tech become? I think that really resonates with people, and no ads—well, no monetization. People ask me a lot about these things, and it was like, I was literally just making a game for my partner, and I made some decisions that we would like.