Elements of Photography:
Guides the viewers eyes to the main subject. Can be vertical, horizontal, curved or jagged.
Line is the most important element of all and also the most strongest in its meaning. Your eyes follow the line whether it is visible or invisible. Based on its character and direction, lines communicate emotions making it one of the strongest elements of design.
Horizontal lines suggest feeling of restfulness or calmness, vertical lines suggest feeling of power, and diagonal lines suggest feeling of movement and direction. Soft curved lines represents relaxing or soothing feel whereas acute or jagged lines suggest frenzy or chaotic feeling and so on.