arch architecture backyard buildings courtyard entrance exterior foliage garden greenery keyhole-doorway landscaping moon-gate moongate paved paving peaceful plants quiet retreat-center retreat-centre sepia shrubbery tranquil tranquility trees vegetation walkway walls yard black-and-white gray grey greyscale monochrome architectural Asian chinese christian harmonious harmony peace retreat round rounded surroundings Bield celtic christianity cross decorative faith wood wooden bare crucifixion grass grounds mist misty plain religious