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The child hurriedly took off his shirt and sandals and began running on the sand. His parents observed him for a while but convinced that there was no danger in the desolate beach, nearly empty at that early hour, took care of other things. The mother began to spread sunscreen throughout her body and the father installed the beach umbrella in the sand and opened the newspaper under its shadow.
The boy approached the umbrella and picked up a shovel and a bucket to make castles in the sand and walked away again. That day there was a very remarkable low tide, result of a spatial coincidence of the Sun and the Moon superimposing their attraction and repulsion and thus exaggerating the tidal magnitude.
The child was attracted by large snails that the sea had left exposed in its retr
