Using light and dark colors differently in a room can give an entirely perception of the space. Typically light colors and warmer tones will make a room look bigger while darker and cooler colors make a room look smaller.
Read below other optical illusions you can create using different colors and tones.
1 Color: Using the same color &/or various tints and shades of it throughout a room keeps the room looking as it actually is. Light makes it seem bigger though and typically dark makes it seem smaller.