photo CC BY-NC 2.0 by  rocorThe Duplex Cone sculpture by artist Roger Berry is located in the Arrowhead Marsh of Martin Luther King Jr. Regional Shoreline park, Oakland, California.  During the summer solstice, the sun follows along the edge of the larger cone, and then during the winter solstice, the sun follows along the edge of the smaller cone. 1

 

photo CC BY-NC 2.0 by  rocor

Additional Links

  1. Roger Berry official website