For context, Kane wore a pin of the sun with a face to the Backrooms premiere, and when asked about it he stated "The sun told me to wear it. It talks to me."

To be more specific, this is referencing a now-recurring motif in his Backrooms series that began in FF3, where multiple images of a similar sun are seen in the video. Not enough is known yet to speculate about what they mean, but according to Kane himself and insider sources, the sun imagery is related to "Splendor," a new work of his that is at an unknown stage of development.

In this artwork specifically, the sun guy is referencing an 18th century illustration called "The Alchemist Who Has Achieved Illumination," which Kane has used as his online profile picture and the cover image to his song The Kind Old Sun