The way an oyster does A Fragment by Kay Ryan www.csmonitor.com Her poems, [Kay Ryan] says, don't begin with a simple image or sound, but instead start "the way an oyster does, with an aggravation." An old saw may nudge her repeatedly, such as "It's always darkest before the dawn" or "Why did the chicken cross the road?" "I think, 'What about those chickens?' " she says, "and I start an investigation of what that means. Poets rehabilitate clichés." poetrymeaningcliché
Crown A Poem by Kay Ryan www.poetryfoundation.org Too much rain loosens trees. In the hills giant oaks fall upon their knees. You can touch parts you have no right to— places only birds should fly to. naturetreesmelancholytouch
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