In a state of reverberation Irwin's terms of sudden, physical realization – bam! – call to mind the suddenly enlightening Zen slap or rap on the forehead. It also calls to mind [Philip Guston]'s own remark..."Look at any inspired painting...it's like a gong sounding; it puts you in a state of reverberation." Reverberation is another way of suggesting a kind of sudden, energetic, physical experience. Philip Guston, Robert Irwin: A Conditional Art I have pacified your mindIt's dark outsideScraps of the brocade of autumn zenartunderstanding
Wang tiles Wang tiles (Hao Wang, 1961) are a class of formal systems. They are modelled visually by square tiles with a color on each side. A set of such tiles is selected, and copies of the tiles are arranged side by side with matching colors, without rotating or reflecting them. The basic question about a set of Wang tiles is whether it can tile the plane or not, i.e., whether an entire infinite plane can be filled this way. The next question is whether this can be done in a periodic pattern. In 1966, Wang's student Robert Berger solved the problem in the negative. He proved that no algorithm for the problem can exist, by showing how to translate any Turing machine into a set of Wang tiles that tiles the plane if and only if the Turing machine does not halt. The undecidability of the halting problem then implies the undecidability of Wang's tiling problem. Wikipedia en.wikipedia.org Truchet TilesThe Tiling Patterns of Sebastien Truchet and the Topology of Structural Hierarchy mathalgorithms