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?
Woodblock Prints
It seems to me that many printmakers are suffering under a delusion. Looking at current trends, it appears that recent prints are simply copying fine art and painting. Some printmakers are working in the nanga style of painting. Others are attempting to reproduce the effects of oil. Some cleverly contrived prints are often difficult to distinguish from paintings done with a brush. The question arises: Why are these printmakers working in the medium of woodblock printing at all?
For prints to follow in the footsteps of painting has very little meaning. The art of the brush and palette should be left to the brush and palette.
The fountainhead of beauty
It might be said that the carving of a woodblock encompasses the greatest restriction on freedom. Printmakers come under extraordinary natural constraints on their work. Strangely enough, however, it is this restriction that is the fount of beauty. Constraint and restriction themselves become a blessing.
...Many people see a lack of freedom as the death knell of art. That may be true in the case of the fine arts, but in the handicrafts, lack of freedom is the fountainhead of beauty.
The preliminary sketch
Among the best woodblock prints are many that seem not to have adhered strictly to the preliminary sketch. The sketch simply indicated a general direction, and in many cases was not used at all. Or it was even improved upon in the process of carving and brought vividly to life; the woodblock qualities of the print were accentuated and highlighted.