Might it be a door into "Confucianism"?The Master's voice comes from the slabs of stone "Is it not delightful to have a friend come from afar ?" And then He'd whisper in your ear:"Few there be that find the door."
Similar in ‘framing’ style to your Kaiyuan Temple image and it carries such a strong sense of space and presence. The red lanterns cleverly bring this to life.