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?
Once you choose the technology that runs your blog, use it. Don’t replace it, ever. Never ever rewrite it.
If you’re trying to blog, write. Work in the ‘posts’ and ‘drafts’ folders. Create TODO lists and schedules to get posts live. Stay out of the blog configuration, templates, plugins, and whatnot.
...This is a specific instance of a larger problem: most people are unable to finish their side projects or focus on their side hustles, because they get distracted and sidetracked by tinkering and other things that increase the complexity of the project, instead of working toward the original goal. Being able to manage oneself is a skill as useful as it is rare, and I’m sure there are a few business books that draw that idea out into hundreds of pages.