In a decorative installation, the eye needs places to rest. Quiet tiles provide that pause. Their open ivory centers and small corner details connect the more elaborate pieces without competing with them.
Think of negative space as part of the artwork. It makes rich colors appear brighter, helps individual motifs remain legible, and allows a large backsplash to feel calm even when it contains many different designs.
A useful starting point is one quiet tile for every decorative tile. From there, adjust the balance to suit the room: more quiet tiles for a serene bathroom, or more design tiles for a jewel-box kitchen or bar.