The Clam, one of a number of incidents between The Helper and The Weeper. The others include seaweed and "jellyfish incidents [which] are quite remarkable for their occasional aberrative force". Encounters between jellyfish and cave walls are held to be responsible for the emergence of "a shell as in the clam".
The Clam is one among several occurrences involving The Helper and The Weeper. Other incidents include seaweed and "jellyfish events [which] stand out for their unusual power". Interactions between jellyfish and cave walls are believed to produce a shell, similar to that in a clam.