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?
the authenticity of the gesture
as if the air had taken on substance
representation and re-presentation
a first order of presence
this painterly game of pick-up sticks
Irwin's "fetish finish"
questions all of whose possible answers would never exhaust them
the art is what has happened to the viewer
an art of things not looked at
a dialogue of immanence
the information that takes place between things
your house is the last before the infinite
his "project of general peripatetic availability"
that shiver of perception perceiving itself
a desert of pure feeling