Dewberry

Dewberry. Missouri, 1980.

Photo by I. Peterson

Pitt Point

Fifth Avenue Place, Pittsburgh, Pennsylvania, 2010.

Photo by I. Peterson

Silver Wave

Amity by David Lee Brown. The Gallery at Market East, Philadelphia, Pennsylvania, 2000.

Photo by I. Peterson

Alien Shadows

Bradley University, Peoria, Illinois, 2009.

Photo by I. Peterson

Ellipsoid Spirals

Longwood Gardens, Kennett Square, Pennsylvania, 1978.

Photo by I. Peterson

Water Posts

Palo Alto Baylands Nature Preserve, California, 2009.

Photo by I. Peterson

Web Galaxy

Water droplets on a spider web. Big Basin Redwoods State Park, California, 1983.

Photo by I. Peterson

Banner Hall

National Gallery of Canada, Ottawa, Ontario, 2000.

Photo by I. Peterson

Waterfall Heights

Waterfall. Columbia River Valley, Oregon, 1977.

Photo by I. Peterson

Canyon Cracks

Agawa Canyon. Algoma, Ontario, 1974.

Photo by I. Peterson

Fortress of Louisbourg

Fortress of Louisbourg. Cape Breton, Nova Scotia, 1973.

Photo by I. Peterson

Knight's Tour

Synergy (8 x 8 x 8 Knight Tour) by Loren Larson. St. Olaf College, Northfield, Minnesota, 2010.

For more, see "Knight Moves in 3D." Also: "A Knight's Tour de Force" by Adam H. Berliner.

Photo by I. Peterson

Circles Series

Circle III (foreground) of David Smith's Circles series. National Gallery of Art, Washington, D.C., 2008.

Photo by I. Peterson

Stepped Triangle

Untitled sculpture by Donald Judd. National Gallery of Art, Washington, D.C., 2008.

Photo by I. Peterson

High Lines

Empire State Building, New York City, New York.

Photo by I. Peterson

Supporting Triangles

New Orleans, 2010.

Photo by I. Peterson

Longfellow in Nova Scotia

Henry Wadsworth Longfellow, 1807-1882. Grand-Pre National Historic Site of Canada, Grand Pre, Nova Scotia, 1974.

Plaque text: "Evangeline", his poignant tale of the Acadian lovers of Grand Pre has enshrined in the hearts of the world the tragic memory of the expulsion, two centuries ago.

Photo by I. Peterson

Cylinder Moon

Cylinder Moon by Cheryl Farber Smith. Department of Mathematics, University of Nebraska, Lincoln, 2012.

Photo by I. Peterson

Shore Birds

Assateague Island National Seashore, Maryland, 1982.

Photo by I. Peterson

Rain Garden Forms

Vascular Form #10 (detail) by Foon Sham. Rain Garden installation, L Street and 19th Street, N.W., Washington, D.C., 2016.

Turning Point (foreground) and Droplet. 

Droplet.

Photos by I. Peterson

Stone Flower

Montreal, Quebec, 2010.

Photo by I. Peterson

Broken Bridge

Near Columbia, Missouri, 1981.

Photo by I. Peterson

Campus Peepholes

Peephole sculpture (untitled) by Charles Huntington. Western Michigan University, Kalamazoo, Michigan, 2011.

Photos by I. Peterson

Monumental Balancing Act

Washington Monument, as seen from the sculpture Infinity by Jose de Rivera. National Museum of American History, Washington, D.C., 2016.

For more on the sculpture, see "Infinity in Eight Minutes."

Photo by I. Peterson

Shell Deposit

Shells. Ocean City, Maryland, 1979.

Photo by I. Peterson

Prairie Sunset

Prairie sunset. Manitoba, 1977.

Photo by I. Peterson

Capitol Reflections

Reflected image of the Wisconsin State Capitol. Madison, Wisconsin, 2008.

Photo by I. Peterson

Independence Day Flag

United States flag. World War II Valor in the Pacific National Monument, Pearl Harbor, Hawaii, 1983.

Photo by I. Peterson

Pentagons for Floors

Tiling of identical pentagons, foyer floor. Mathematical Association of America (MAA) Headquarters, Washington, D.C., 2008.

See also "Tiling with Pentagons."

Photo by I. Peterson

Fifth Third

Fifth Third Bank logo. Lexington, Kentucky, 2011.

Shouldn't that be five thirds?

Photos by I. Peterson

Canada Day View

View from the roof of the Embassy of Canada toward the U.S. Capitol. Washington, D.C., Canada Day, 1986.

Photo by I. Peterson