- Color will make the room look larger or smaller.
- Size will detemine the number of grout joints. Large-unit tiles work equally well in large or small rooms. Smaller tiles are usually intended for smaller rooms or to create a pattern.
- Direction will create either a visual flow or a distincitve area

To make a room appear - Use

Larger - Light-medium colors or large format tiles
Smaller - Medium-dark colors or small format tiles

Lighter - Light-medium colors
Darker - Medium-dark colors (dark colors work best in rooms with plenty of natural light)

Warmer - "Warm" colors
Cooler - "Cool" colors

Neutral color - Larger tiles with coordinating grout joints or stone tile with thin coordinating grout joints
Color accents - Inset color using field tile or decos

Larger with a visual flow - Using the same tile from room to room
Distinctive rooms and areas - Change the size, the direction or use decos