Feng Shui: Some call it philosophy. Some call it art or science. And some call it superstition.
Crystals: Similar thing. Like horoscopes and fortune telling, some call the supposed energy from a rock either science or fantasy.
Architecturally, Feng Shui is often referred to as the art of placement. And the use of crystals, gemstones and geodes in architectural design can contribute in various ways to the experience of a room. For both Feng Shui and crystals, I call it the art of intention.