Simplify the following text for a Grade 7 native English-speaking person.
Original: 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 .
Simplified: 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 .