In India, I've seen sacred places that are just a red circle put around a stick or stone in such a way that the environment becomes metaphoric: when you look at that stick or stone, you see it as a manifestation of Brahman, a manifestation of the mystery.
Sacred space is a space that is transparent to transcendence, and everything within such a space furnishes a base for meditation.
— Joseph Campbell, A Joseph Campbell Companion by Diane Osbon