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The American quilt: A history of cloth and comfort, 1750-1950 (1993). LaPinta, Linda Elisabeth. Kentucky Quilts and Quiltmakers: Three Centuries of Creativity, Community, and Commerce (University Press of Kentucky, 2023) online review of this book. Torsney, Cheryl B., and Judy Elsley, eds. Quilt Culture: Tracing the Pattern. (U of Missouri ...
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
This is an example of a wallpaper with repeated horizontal patterns. Each pattern is repeated exactly every 140 pixels. The illusion of the pictures lying on a flat surface (a plane) further back is created by the brain. Non-repeating patterns such as arrows and words, on the other hand, appear on the plane where this text lies.
The Ehrenstein illusion is of a bright disc. Closely related to Kanizsa figures is the Ehrenstein illusion. Instead of employing circles with missing wedges, the Ehrenstein illusion triggers an illusory contour percept via radial line segments. Ehrenstein's discovery was originally contextualized as a modification of the Hermann grid. [3]
On the relation between mathematics and the ordered patterns of Op art: 1965 Aug: Thoughts on the task of communication with intelligent organisms on other worlds: 1965 Sep: The superellipse: a curve that lies between the ellipse and the rectangle: 1965 Oct: Pentominoes and polyominoes: five games and a sampling of problems 1965 Nov
The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame, two dimensional drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.
Examples of visually ambiguous patterns. From top to bottom: Necker cube, Schroeder stairs and a figure that can be interpreted as black or white arrows. Multistable perception (or bistable perception) is a perceptual phenomenon in which an observer experiences an unpredictable sequence of spontaneous subjective changes.
The Müller-Lyer illusion is an optical illusion consisting of three stylized arrows. When viewers are asked to place a mark on the figure at the midpoint, they tend to place it more towards the "tail" end. The illusion was devised by Franz Carl Müller-Lyer (1857–1916), a German sociologist, in 1889. [1] [2] [3]
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