The Sea Shell, Benozzo Gozzoli (1420-1497) Church of St. Augustine San Gimignano
There is a story told about St. Augustine as he was writing about the Holy Trinity.
He saw a boy playing on the beach who had dug a hole in the sand and was going out to the sea again and again and bringing some water in a little sea shell to pour into the hole. St. Augustine asked him, “What are you doing?” “I’m going to pour the entire ocean into this hole.” “That is impossible, the whole ocean will not fit in the hole you have made,” said St. Augustine. The boy replied, “And you cannot fit the Trinity in your tiny little brain.” The boy then disappeared and Augustine believed he had seen an angel.