Today's previous post was "Midnight in Oslo (continued)."

The link "a 4-element set" in "Midnight"
was to a more elaborate structure in a post titled "Tesseract."

In memory of an Oslo "hero of midnight"
(a phrase quoted here last September 1)—

A search for material that is more entertaining—
Odin 's Tesseract.

See also a related Hollywood story in The Washington Post .