Genko-An Temple, Kyoto, Japan - Unknown Source
The most well known features of Genkouan (源光庵) are two windows in the main hall that look out onto a less orderly, but no less inspiring, garden of flowering trees and stone lanterns. One window is square, representing four human afflictions: life, old age, illness, and death. The other is round, representing Zen awakening.
Turn away from these windows and walk over to the opposite wall. Just to the right of the center of the ceiling is a very clear footprint.