One-sided ring? Market Street, San Francisco, California, 2018.
Photo by I. Peterson
January 31, 2019
January 30, 2019
Gnarly
Sculpture, San Francisco War Memorial Veterans Building, San Francisco, California, 2018.
Photo by I. Peterson
January 29, 2019
Squares within Squares
Plaza tiling, Civic Center, Davies Symphony Hall, San Francisco, California, 2018.
Photo by I. Peterson
January 28, 2019
January 27, 2019
Balanced Unbalanced
Balanced Unbalanced T by Fletcher Benton. Civic Center, Davies Symphony Hall, San Francisco, California, 2018.
Photos by I. Peterson
January 26, 2019
Pieces of a Reclining Figure
Large Four Piece Reclining Figure by Henry Moore. Civic Center, Davies Symphony Hall, San Francisco, California, 2018.
Photos by I. Peterson
January 25, 2019
Flying Vees
Double L Excentric Gyratory by George Rickey. San Francisco Public Library, San Francisco, California, 2018.
See also "One Up, One Down."
Photo by I. Peterson
January 24, 2019
January 23, 2019
Framed 50
50 United Nations Plaza Federal Office Building, San Francisco, California, 2018.
Photo by I. Peterson
January 22, 2019
January 21, 2019
Cutouts
Gary Diptych 1 by Richard Mayer. Hastings College of Law, San Francisco, California, 2018.
Photos by I. Peterson
January 20, 2019
Wall Weave
Wall mural by Alicia McCarthy, 7th Street overlooking Civic Center BART station, San Francisco, California, 2018.
Photos by I. Peterson
January 19, 2019
Topograph
Topograph by Kendall Buster. Terminal 2, San Francisco International Airport, California, 2018.
Photo by I. Peterson
January 18, 2019
January 17, 2019
Spherical Triangles
Waterfront Park Playground, San Diego, California, 2018.
See also "Pentagonal Climbing."
Photo by I. Peterson
January 16, 2019
January 15, 2019
January 14, 2019
January 13, 2019
Stone Octopus
Wall mosaic, Boardwalk near Pacific Beach Lifeguard Station, San Diego, California, 2018.
Photo by I. Peterson
January 12, 2019
January 11, 2019
January 10, 2019
January 9, 2019
January 8, 2019
January 7, 2019
January 6, 2019
Groundswell
Large-scale metal sculpture by Christopher Puzio. San Diego, California, 2018.
Photos by I. Peterson
January 5, 2019
Double Entendre
Double Entendre by Bruce Gray. Lobby, DoubleTree by Hilton San Francisco Airport, Burlingame, California, 2018.
Photo by I. Peterson
January 4, 2019
Nonsimple
Nonsimple by Goran Konjevod. Exhibition of Mathematical Art, Joint Mathematics Meetings, San Francisco, California, 2010.
Photo by I. Peterson
January 3, 2019
January 2, 2019
Logarithmorum
The title page of John Napier's tables of logarithms. Published in 1614, these tables were recognized immediately as a significant new computational tool of great value to astronomers.
Reproduced from the collections of the Library of Congress.
January 1, 2019
2019
2019 = 3 x 673
2019 is the product of two primes whose sum is a perfect square (A141755): 3 + 673 = 676 = 26 x 26.
2019 is the first 4-digit number to appear six times in the decimal expansion of pi (A276686).
2019 is a Happy-go-Lucky number (A091431). It is both a Happy number (A007770) and a Lucky number (A000959).
2019 is the sum of the first 22 perfect powers (A076408).
2019 is a number n such that n, 2n, and 3n together contain every digit from 0 to 9 (A120564): 2019, 4038, 6057.