The title derives from the fact the cactus was photographed in Pinal County, Arizona.
Not even close to my best shot for the outing, but seemed to match the serendipity theme a couple ways:
1-Double decker cactus are rare.
2-The analogy to the Leaning Tower of Pisa was both humourous and serendipitous.
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I like the contrast of colors from the cactus and the background. What I like best is the angle of the tree giving interest and keeping the eye focused.