D.C. Spaulding - Postcard

What is this artist doing? D.C. of Lomita CA. U.S.A. says - " Anthropologists have a new htpothesis about the people who erected the henge at the archaeological site known as Posthenge, located on the sunny southeastern coastal plain of Lomita, California. It is belived these people were part of a dead letter cult and would bring all undeliverable mail, especially mail art, to the henge on the veve of the Summer Solstice. As the first light of daybreak illuminated the "Navigator Post", the mail would travle towards the heavns and be guided safley to it's intended destination."