Salamander Tie in Taupe
$39.95
Based on a tessellation designed by Escher in 1942. In taupe and brown.
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Jumbo Dice Assortment
$9.95
Set of eight large dice, with 4, 6, 8, 10, 12, 20, 24, and 30 sides. Save over $2 compared to buying separately! You may specify white, black, or mixed colors, and while we can't guarantee it, we'll do our best to provide the colors you want.
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Kites and Darts Magnet Pack
$24.95
These tiles, also known as Penrose tiles after their inventor, form endless patterns, none of which are repeating. Among their many intriguing properties is the way in which the Golden Ratio crops up over and over again. Ages 8 to adult. 108 magnetic foam pieces.
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Aluminum Polyhedra in Black
$29.95
Set of eight geometric solids -painted black. Ages 13 to adult.
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KnoTiles
$14.95
Everyone is familiar with the utilitarian and decorative uses of knots, but mathematicians study knots as well. KnoTilesTM is a puzzle that serves as an introduction to the mathematics of knots and the symmetry of knot designs. All of the knots through seven crossings can be formed with the set, and the instructions contain over a dozen brain teasers. The puzzle pieces feature photographic rope images, with a second color of rope on some pieces to allow the formation of links (like knots, but with more than one strand). 105 cardboard pieces. Grades 3-12.
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"Fractal Trees"
$19.95
In this book, by combining photographic imagery with iteration, the mathematical process at the heart of fractals, Robert Fathauer explores his unique vision of a nature that is even more fractal than the real world. These creations include a fern-like tree built from the stem of a rose bush, an infinite collection of spirals formed from the skeleton of a cholla cactus, and a tree whose outline resembles a maple leaf. Thirteen different trees are shown in two page spreads, and six randomized fractal trees are shown as well. The book also includes a section on the method used to create the trees and notes on the individual trees. Included are three classroom worksheets that teachers can copy, covering branching of fractal trees, trees in nature, and infinite series. By Robert Fathauer. 52 pages, 8-1/2" x 11".
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SIGMAA-ARTS Fish T-shirt – Large
$14.95
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SIGMAA-ARTS Fish T-shirt – Extra Large
$14.95
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SIGMAA-ARTS Polygons T-shirt – Medium
$14.95
This T-shirt also commemorates the formation of the new SIGMAA on mathematics and the arts. This graphic, by Douglas Dunham, is based on the uniform tiling (4.5.4.5) of the hyperbolic plane with squares and pentagons subdivided into isosceles triangles. It was inspired by patterns of the Australian hooked rug maker Tony Bomford and a combinatorial pattern by H.S.M. Coxeter that provided the color symmetry. There are six "bright" colors and six shades of tan. Each bright color surrounding a pentagon is paired with the shade of tan not contained within that pentagon.
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SIGMAA-ARTS Polygons T-shirt – Large
$14.95
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SIGMAA-ARTS Polygons T-shirt – Extra Large
$14.95
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