Visual composition techniques can be used to direct the viewer's eye and interpret the artist's message. Lines draw the eye into patterns and force the viewer to look where intended. Basic 2D and 3D shapes are building blocks that increase complexity when used properly. Color, texture, depth, light, and motion can be manipulated to highlight certain areas or create specific effects. Balance, emphasis, positive/negative space, proportion, repetition, and contrast are techniques that relate elements and distinguish the important aspects of the photo. Variety and harmony make images more interesting and aesthetically pleasing.