Orpheus in Greek mythology was a Thracian bard, legendary musician and prophet. He was also a renowned poet and, according to the legend, travelled with Jason and the Argonauts in search of the Golden Fleece, and even descended into the underworld of Hades, to recover his lost wife Eurydice.
The "non-narrative" stop motion film that is being made by Nick Nolte's character seems to be a nod to the stop-motion film Mad God (2021) by Phil Tippett. Tippett consulted on the episode and constructed the miniatures used.