The Efficient Oval's Good Offices

In one of probabilities ploys the oval shells collected from Belongil Beach, where pebbles, rolled smooth by sand and waves are in greater frequency than shells, are balanced two left, two right, and so make something of a mirror in this composition. The oval, oblated, seems one of  nature's more efficient shapes, but perhaps for both the shells, fated to be ground to grit, and the pebble, on its way to sand, they are just intermediate formalities?

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