December 31, 2018

Melbourne Eve


With my father, Arnis Peterson (right), and my uncles Arturs Zosens (second from right) and Voldemars Zosens (left), New Year's Eve, Melbourne, Australia, 1979.

See also "McKenzie Island."

December 30, 2018

December 29, 2018

Winter Houses


Washington, D.C., 2010.

Photo by I. Peterson

December 28, 2018

Ski Trails


Near Lake Louise, Alberta, 1986.

Photo by I. Peterson

December 27, 2018

Star of India


Star of India, San Diego, California, 2018.

Photo by I. Peterson

December 26, 2018

Lamp Wreath


United Nations Plaza,  San Diego, California, 2018.

Photo by I. Peterson

December 25, 2018

Holiday Trio


Washington, D.C., 2018.

Photo by I. Peterson

December 24, 2018

Plaza Colors


Plaza, Santa Fe, New Mexico, 2015.

Photo by I. Peterson

December 23, 2018

Holiday Snowflake


Window display, Milan, Italy, 2010.

Photo by I. Peterson

December 22, 2018

Still Waters


Near Columbia, Missouri, 1981.

Photo by I. Peterson

December 21, 2018

December 20, 2018

Garden Pyramid


Four-Sided Pyramid by Sol LeWitt. Sculpture Garden, National Gallery of Art, Washington, D.C., 2008.

See also "LeWitt's Pyramid."

Photo by I. Peterson

December 19, 2018

Icy Ottawa


Ottawa, Ontario.

Photo by I. Peterson

December 18, 2018

December 17, 2018

Star Lights


Mini-Nova by Abram Santa Cruz. Exploratorium, San Francisco, California, 2017.

Photo by I. Peterson

December 16, 2018

Wright Window


Window by Frank Lloyd Wright. Virginia Museum of Fine Arts, Richmond, Virginia, 2016.

Photo by I. Peterson

December 15, 2018

Light Trees


Canyon Road, Santa Fe, New Mexico, 2015.

Photo by I. Peterson

December 14, 2018

Frosty Pine


Santa Fe, New Mexico, 2015.

Photo by I. Peterson

December 13, 2018

December 12, 2018

Snow Bank


Kingston, Ontario, 1974.

Photo by I. Peterson

December 11, 2018

December 10, 2018

Old Growth


Spring City, Tennessee, 2014.

Photo by I. Peterson

December 9, 2018

Snow Family


Toronto, Ontario.

Photo by I. Peterson

December 8, 2018

Light Globe


Washington, D.C., 2018.

Photo by I. Peterson

December 7, 2018

Winterfall


Tuckerman Ravine Trail, White Mountain National Forest, Pinkham Notch, New Hampshire, 2018.

Photo by I. Peterson

December 4, 2018

Mount Monroe


View toward Boott Spur and Mount Monroe. Appalachian Mountain Club Joe Dodge Lodge, Pinkham Notch, New Hampshire, 2018.


Photos by I. Peterson

December 3, 2018

Moebius Splits


Wood sculpture featuring a split Moebius strip by Larry Frazier. Joint Mathematics Meetings, New Orleans, Louisiana, 2011.

See also "Split Strips."

Photo by I. Peterson

December 1, 2018

Confining Infinity


Limits of Infinity III by John Safer. George Washington University, Washington, D.C., 2000.

"I carved the interior shape while groping for a shape which would seem fulfilling, internally harmonious, and perhaps inspiring," John Safer explained. "When that part of the sculpture was complete, I realized that it was a three-dimensional rendition of the symbol for infinity. Safer chose to orient his sculpture vertically rather than horizontally and mounted it within an elliptical frame--in effect, confining infinity.

See also "Limits of Infinity."

Photo by I. Peterson

November 30, 2018

Knot Shadow


Knot sculpture by Nat Friedman. Albany, New York, 2000.

The continuous loop of a three-dimensional mathematical knot constructed from copper tubing casts a shadow that can vary greatly in appearance and complexity, depending on the viewpoint and light direction.

Photo by I. Peterson

November 29, 2018

Ten Tetrahedra


Solar System by Eve Torrence. Exhibition of Mathematical Art, Joint Mathematics Meetings, San Francisco, California, 2010.

Photo by I. Peterson

November 27, 2018

Open House


Toronto, Ontario, 2015.

Photo by I. Peterson

November 26, 2018

November 25, 2018

Granny Pillow


Dihedral Granny Pillow by Andrea Heald. Gallery of Mathematical Art, Joint Mathematics Meetings, Boston, Massachusetts, 2012.

Photo by I. Peterson

November 24, 2018

Snow Soldier


Washington, D.C., 1982.

Photo by I. Peterson

November 23, 2018

Fractured Flower


Design by Antoni Gaudi. Parc Guell, Barcelona, Spain, 2007.


Photos by I. Peterson

November 22, 2018

November 20, 2018

November 19, 2018

November 18, 2018

Vegemite Place


Jaisalmer India, 2010.

Photo by I. Peterson

November 17, 2018

Rudder Ice


Kingston, Ontario, 1974.

Photo by I. Peterson

November 16, 2018

Ptolemy and Regiomontanus



This frontispiece from Epitoma in Almagestum Ptolemaei, published in 1496, shows its author, Regiomontanus, and a crowned Ptolemy.

Reproduced from the collections of the Library of Congress.

November 15, 2018

Madison Glow


Wisconsin State Capitol, Madison, Wisconsin, 2008.

Photo by I. Peterson

November 14, 2018

Shore Splash


Ocean City, Maryland, 1979.

Photo by I. Peterson