Cobbles.

My neighborhood park in Tempe features an artificial 13-acre lake (5 ha), stocked by the Arizona Department of Game and Fish. It is a popular spot among anglers with few fishing opportunities in this parched desert environment. It is also popular with migrating waterfowl.  The lake bottom is built of gravel and large cobbles to provide cover for fish. Around the lake’s perimeter some of these small boulders rise just below the surface, and give the birds a place to stand and stretch. The constant burnishing of hundreds of webbed feet scours away the biofilms and filamentous algae that cover the stones. The action produces one of those wonderful abstractions that I love to discover in nature – an effect that is simultaneously regular and patternless and not quite random. 

Cobbles.

My neighborhood park in Tempe features an artificial 13-acre lake (5 ha), stocked by the Arizona Department of Game and Fish. It is a popular spot among anglers with few fishing opportunities in this parched desert environment. It is also popular with migrating waterfowl.  The lake bottom is built of gravel and large cobbles to provide cover for fish. Around the lake’s perimeter some of these small boulders rise just below the surface, and give the birds a place to stand and stretch. The constant burnishing of hundreds of webbed feet scours away the biofilms and filamentous algae that cover the stones. The action produces one of those wonderful abstractions that I love to discover in nature – an effect that is simultaneously regular and patternless and not quite random.