January 31, 2016

Stadium Skylight


Stadium-shaped (a rectangle capped by semicircles) skylight, Cantor Arts Center at Stanford University. Palo Alto, California, 2013.

Photo by I. Peterson

January 30, 2016

Tessellated Tower


Tower with steep, tessellated roof. St. Olaf College. Northfield, Minnesota, 2010.


For another mathematical sight at St. Olaf College, see "Knight Moves in 3D."

Photos by I. Peterson

January 29, 2016

Ladders and No Chutes


Ladders, but no chutes. New York City, 2014.


Photos by I. Peterson

January 28, 2016

Steel Diamond


Diamond by Jiro Naito. Diamond Street, New Orleans, 2007.



For more mathematical sculptures and other sites in New Orleans, see "Geometreks in New Orleans," "Three Sentinels," "New Orleans Dawn," "Tensegrity Tower in New Orleans," and "South Meets South." 

Photos by I. Peterson

January 27, 2016

Sand Ripples


Ripple pattern in sand. White Sands National Monument, New Mexico, 1979.

Photo by I. Peterson

January 26, 2016

Birches and Snow


Birches and snow. New Hampshire, 1985.

Photo by I. Peterson

January 25, 2016

January 24, 2016

Solid Illusion


She Who Must Be Obeyed by Tony Smith. Frances Perkins Building, Washington, D.C., 2015.


Other views of the sculpture, which consists of rhomboid units bolted and welded together.


For another sculpture by Tony Smith, see "Octahedral Moondog." 

Photos by I. Peterson

January 23, 2016

Street Lights


The lighted signs stretched across the street are a public artwork. Torino (Turin), Italy, 2010.

Photo by I. Peterson

January 22, 2016

Pentagonal Climbing


Playground climbing structure with pentagonal symmetry. Mount Royal Park (Parc du Mont-Royal), Montreal, Quebec, 2010.

Photo by I. Peterson

January 21, 2016

Geometric Stepping Stones


Geometric stepping stones, Fountain of "Four Seasons" by Francois Stahly. Sydney G. Watson Square, San Francisco, 2010.

Photo by I. Peterson

January 20, 2016

Leaf on Leaf


Leaf on leaf on grid, part of installation by Susan Schelle and Mark Gomes. Bloor Parkette (southeast corner of Bloor Street West and Spadina Avenue), Toronto, 2009.

Photo by I. Peterson

January 18, 2016

Birds on Wires


Birds on wires; points on intersecting lines. Austin, Texas, 2009.

Photo by I. Peterson

January 17, 2016

Roof Triangles


Pyramidal rooftop skylights, with triangular faces. Portland, Oregon, 2009.

Photo by I. Peterson

January 16, 2016

Fern Fronds


Fractal-like fern fronds. Lake MacDonald, Quebec, 2009.

Photo by I. Peterson

January 15, 2016

Annular Bench


Segmented annular bench on grounds of Sarah Lawrence College. Bronxville, New York, 2009.

Photo by I. Peterson

January 14, 2016

Memorial Parallel Lines


Parallel lines at the Irish Hunger Memorial, 290 Vesey Street. New York City, 2009.

Photo by I. Peterson

January 13, 2016

Banner Array


Array of banners. Carnegie Mellon University, Pittsburgh, Pennsylvania.

Photo by I. Peterson

January 12, 2016

January 11, 2016

Frosted Pine


Frosted Ponderosa pine. Santa Fe, New Mexico.

Photo by I. Peterson

January 10, 2016

January 9, 2016

Rabbit Tracks in Snow


Frieze symmetry of rabbit tracks in snow. Santa Fe, New Mexico.


Photos by I. Peterson

January 8, 2016

January 7, 2016

January 6, 2016

Icicle Distributions


Arrays of icicles hanging from eaves can form in a variety of geometric configurations. Meadville, Pennsylvania, 2010.



Photos by I. Peterson

January 5, 2016

Black Snowm'n


Snowm'n by FASTWĂśRMS. Metro Toronto Convention Centre, Toronto, 2006.

Photo by I. Peterson

January 4, 2016

Winter Sailing


Winter sailing on the Charles River. Cambridge, Massachusetts, 2011.

Photo by I. Peterson

January 3, 2016

Barcelona Arches


Array of highlighted arches, Barri Gotic, Cuitat Vella (Old City). Barcelona, 2007.

Photo by I. Peterson

January 2, 2016

Hardware Starry Night


Vincent van Gogh's Starry Night as interpreted in door knobs and other hardware by David van Go-berg (David Goldberg). Union Hardware, Bethesda, Maryland.


Photos by I. Peterson

January 1, 2016

Ice Cone


Iced pine cone. Washington, D.C., 1983.

Photo by I. Peterson