Diplopia ... seeing double

Having achieved our aim of arriving early, the beach, although not deserted, was quiet. The Spring sun was above the ridge, but still low enough to cast a long, clear shadow. The sea-weed had hung there for many a day so, although wet, was not moist. It was shrivelled and taut, with a pungent smell. Looking more like reinforcing bars for a concrete slab, than shark-proof netting, the enclosure provides security, even though a Wobbegong could easily slither through.