From Nancy Blum site: This 42 inch in diameter, cover is placed in 50 locations around heavily trafficked parts of Seattle, WA. Cast in iron, the ’flowers’ graphically represent the city and the ’electric’ pattern underlying is symbolic of the utility. 2001
This lid also appears with a metal ring, as found in 814 2nd Ave, Seattle, WA 98104, USA Click for a larger image
A cover from a Seattle project where artists were asked to design covers. Additional hatch covers in the project: