Gate of a zen temple
It is said that these Buddhist saints save the human being whose soul would transmigrate six world (hell , hungry demon, brute, syura, humanity, and heaven) till one of the saints 'Mi-ro-ku Bo-sa-tsu ' appears to save us.
We can see these six saints here and there in Japan, especially at the temple or at the entrance of the graveyard.
I saw this very old images at our zen temple.