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?
The Beauty of Miscellaneous Things
By the handling of human hands
This type of beauty grows with each passing day. Utilitarian craftwares become more beautiful the more they are used, and the more beautiful they become, the more they are used.
Moreover, the heavens have ordained that these objects should attain an even greater beauty as they become worn by the handling of human hands.
Devoid of ambition
Miscellaneous handicrafts are devoid of ambition. Their purpose is to serve the needs of the people, not to achieve renown. Just as construction workers who have built a wonderful highway don’t sign their work, neither do artisans append their names to their ware. From beginning to end, without exception, such handicrafts are made by nameless craftsmen. It is this lack of desire for personal recognition that produces their flawless beauty.
The material finds the right object
Rather than the craft object finding the most suitable material, it can be said that the material finds the right object. Folk crafts are invariably the product of a local environment. When a certain locality is rich in a certain raw material, that material gives rise to a certain craftware.
Nothing that nature does not seek
Nature tells us the shape and pattern a material should assume, and nothing good can be achieved by ignoring its dictates. A good artisan seeks nothing that nature does not seek.