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 Pleasure of Observing
Abbreviation
I generally do not like to abbreviate behavioral notes. An important detail may be ignored or considered irrelevant and discarded because it lacks a discrete category on the list. It is often an anecdotal event that offers special insight.
Beyond dry facts
If one has a personal knowledge of the individual animals being studied, observations in field notes cease to be impersonal, and an observer’s empathy can lead beyond dry facts to better intuition and insight.
A study should persist
Since we cannot interview the subject, we can only infer the past from the present. Ideally, a study should persist for at least the life span of an animal.
Precious intangible values
The “precious intangible values” of this wilderness.
Independent fragments of existence
You cannot divide me into independent fragments of existence.
— The Last Panda, 1993
Panda routes
A detailed route of a panda foraging on bamboo shoots, showing the number of shoots eaten and droppings deposited (black spots) on May 31, 1982.