What are the motifs in Motel of the Mysteries by David Macaulay?

The book uses illustrations in a very interesting way. The Illustrations are their own narrative. Macaulay's story of the discovery of the Motel of the Mysteries is told from the conclusions made by Howard Carson as he excavated the site. While Carson uncovers pieces of evidence he begins to draw theories on what the items were used for. His theories begin with the recent National Geographic report stating that other archaeologists had found a similar Tomb some months ago.