20th March EXTRA NOTES

On the Moire and Interference
Etymology of the term Moire is fascinating keep in mind our search for new rhetoric in respect of migration - the migratory linguistic history of the term moire:

From the Wikipedia:

The term originates from moire (or moiré in its French form), a type of textile, traditionally of silk but now also of cotton or synthetic fiber, with a rippled or 'watered' appearance. The history of the word moiré is complicated. The earliest agreed origin is the Arabic mukhayyar (مُخَيَّر in Arabic, which means chosen), a cloth made from the wool of the Angora goat, from khayyara (خيّر in Arabic), 'he chose' (hence 'a choice, or excellent, cloth'). It has also been suggested that the Arabic word was formed from the Latin marmoreus, meaning 'like marble'. By 1570 the word had found its way into English as mohair. This was then adopted into French as mouaire, and by 1660 (in the writings of Samuel Pepys) it had been adopted back into English as moire or moyre. Meanwhile the French mouaire had mutated into a verb, moirer, meaning 'to produce a watered textile by weaving or pressing', which by 1823 had spawned the adjective moiré. Moire (pronounced "mwar") and moiré (pronounced "mwar-ay") are now used somewhat interchangeably in English, though moire is more often used for the cloth and moiré for the pattern.

Here we see migrants as undesirable artifacts !:
[edit] Pattern formation Moiré patterns are often an undesired artifact of images produced by various digital imaging and computer graphics techniques, for example when scanning a halftone picture or ray tracing a checkered plane (the latter being a special case of aliasing, due to undersampling a fine regular pattern).

The drawing on the upper right shows a moiré pattern. The lines could represent fibers in moiré silk, or lines drawn on paper or on a computer screen.


THIS IS NOT PREDICTABLE ...
The nonlinear interaction of the optical patterns of lines creates a real and visible pattern of roughly horizontal dark and light bands, the moiré pattern, superimposed on the lines.[1] More complex line moiré patterns are created if the lines are curved or not exactly parallel. Moiré patterns revealing complex shapes, or sequences of symbols embedded in one of the layers (in form of periodically repeated compressed shapes) are created with shape moiré, otherwise called band moiré patterns. One of the most important properties of shape moiré is its ability to magnify tiny shapes along either one or both axes, that is, stretching. A common 2D example of moiré magnification occurs when viewing a chain-link fence through a second chain-link fence of identical design. The fine structure of the design is visible even at great distances. The moiré is also related to effects seem as imaging through various types of display

The term shadow mask and tension mask attracted me to:

Aperture grille
The Wiki again: Aperture grille based CRT in close-up Image rendered by aperture grille

An aperture grille (tension mask) is one of two major technologies used to manufacture color cathode ray tube (CRT) televisions and computer displays; the other is shadow mask.

Fine vertical wires behind the front glass of the display screen separate the different colors of phosphors into strips. These wires are positioned such that an electron beam from one of three guns at the rear of the tube is only able to strike phosphors of the appropriate color. That is, the blue electron gun will strike blue phosphors, but will find a wire blocks the path to red and green phosphors.

The fine wires allow for a finer dot pitch as they can be spaced much closer together than the perforations of a shadow mask, and there need be no gap between adjacent horizontal pixels. During the display of bright images, a shadow mask will heat up, and expand outward in all directions (sometimes called blooming). Aperture Grilles do not exhibit this behavior - when the wires heat up, they expand vertically. Because there are no defined holes, this expansion does not affect the image, and the wires do not move horizontally.

Frequency fluctuations - different from Moire..
The vertical wires of the aperture grille have a resonant frequency and will vibrate in sympathetic resonance with loud sounds near the display, resulting in fluttering and shimmering of colors on the display. To reduce these resonant effects, one or two horizontal stabilizing wires are welded across the grille wires, and may be visible as fine dark lines across the face of the screen. These stabilizing wires provide the easiest way to distinguish aperture grille and shadow mask displays at a glance. The stabilized grille can still vibrate but the sounds need to be loud and in close proximity to the display.

Additionally, aperture grille displays tend to be vertically flat and are often horizontally flat as well, while shadow mask displays usually have a spherical curvature.

The first patented aperture grille televisions were manufactured by Sony in the late 1960s under the Trinitron brand name, which the company carried over to its line of CRT computer monitors. Subsequent designs, either licensed from Sony or manufactured after the patent's expiration, tend to use the -tron suffix, such as Mitsubishi's DiamondTron and ViewSonic's SonicTron.

While many considered aperture grille technology to produce superior images, advances in shadow mask and hybrid technologies since the 1990s have made people's preferences more a matter of personal choice or specific application. The arrival of inexpensive liquid crystal display (LCD) monitors and other flat-screen designs now challenges both aperture grille and shadow mask CRTs' long reign as the dominant technology behind display screens.

On metaphor - the work of G Pask and Cybernetics.
On Information, conversation and communication theory.

Paper: Cybernetic contributions to a theory of communication : the cases of Donald M. MacKay and Gordon Pask by Dr Albert Muller - Department of Contemporary History in University of Vienna.
albert.mueller@univie.ac.at

Paper for the Austrian Society for Cybernetic Studies. Cybernetics and Systems
Volume 1 - 2008 - Robert Trappl - editor

... discusses how Claude E Shannon's 'A mathematical theory of communication' of 1948 deals with second law of thermodynamics through Ludwig Boltzmans findings on entropy phenomena and the reliability of signal transmission. In the 1980's Shannon became a kind of cult author amongst post-modern media theorists. Muller shows how the work of MacKay and Pask build on deficiencies in Shannons work - Mackay bringing semantics and meaning into discussion ... " Pask concentrated additionally on the characteristics of actors or participants and provided an overall framework of communication by embedding special situations into an observer related system"...

This Moire interference project may be developed to be consistent with Shannon, MacKay and Pasks differing conception of communication.

Notes by GD