Zen gardens are suitable for both outdoor and indoor spaces, as long as the principles of simplicity, balance, and natural beauty are maintained. Outdoor Zen gardens can be integrated into a larger garden or occupy a secluded corner, while indoor Zen gardens are typically smaller, tabletop versions that bring a sense of tranquility to a room. When creating an indoor Zen garden, consider factors like container size, weight, and the type of materials used to ensure they are appropriate for indoor use.