Over the past few years, @Ben_On_The_Moon has photographed his chain link fence due to a mysterious weathering pattern that has caused groups of concentric rings to appear on the upper side of the fence’s segments. His macro photographs emphasize the intriguing apparitions, which appear like miniature crop circles on the metal bars. Despite his research, he has not discovered the specific cause of the pattern.[..]

Source: Unique Weathering Pattern Creates Fascinating Geometric Ripples on a Chain Link Fence