Byōbunozoki

Byōbunozoki originates as an entry in Toriyama Sekien's illustrated bestiary Konjaku Hyakki Shūi (late 18th century). Sekien included many brief, often punning or literarily allusive yōkai entries that rework or index classical and domestic images into singular supernatural beings; the Byōbunozoki is one such artistic/literary creation tied to the household object byōbu (folding screen). Modern summaries of Sekien's commentary present the creature as a being that looks from outside a folding screen into an interior, and Sekien's practice of drawing on earlier literary and historical sources (including an explicit comparative reference to an anecdote from Chinese classics about a ruler and a palace screen) situates the image within a literary-visual mode rather than an ethnographic account of widespread oral belief (sources: Konjaku Hyakki Shūi entry as summarized on Wikipedia; Wikidata).

Sekien's entry and the surviving summaries provide no detailed corporeal description beyond the creature's position and action. The primary descriptive element in the cited sources is that the Byōbunozoki "looks at a person from the outside of a folding screen" and "looks beyond the 7-inch folding screen" (as given in Sekien's commentary as summarized in modern references). No explicit notes on size, color, form, or other physical attributes are preserved in the referenced materials, so the image in the source functions mainly as a pictorial/behavioral motif rather than a fleshed-out anatomical description (sources: Konjaku Hyakki Shūi commentary summarized on Wikipedia; Wikidata).

The only documented action recorded in Sekien's commentary is visual intrusion: the Byōbunozoki peers from outside a byōbu and looks into the screened space. The cited sources limit the creature's attributed activity to this act of peering; they do not provide accounts of speech, possession, violence, or other supernatural effects in connection with the Byōbunozoki. Any further powers or interactions are not recorded in the provided material (sources: Konjaku Hyakki Shūi entry as summarized on Wikipedia; Wikidata).