Input (grade 13): On mosaic floors, the gorgoneion was usually depicted next to the threshold, as if guarding it from hostile intruders; on Attic kilns, the gorgoneion over the kiln door protected from mishaps.
Output (grade 7): On mosaic floors, the gorgoneion was usually near the door, as if guarding it. On Attic kilns, a gorgoneion over the kiln door protected from accidents.