Graphs are another readily recognizable linear device. They are widely used to communicate quantitative information and relationships in a visual way. From the time we first meet them in basic algebra, to the last time we picked up a copy of USA Today , we encounter and interpret graphs. Line also communicates emotion and states of mind through its character and direction. The variations of meaning generally relate to our bodily experience of line and direction.
Horizontal line suggests a feeling of rest or repose.
Objects parallel to the earth are at rest in relation to gravity. Therefore compositions in which horizontal lines dominate tend to be quiet and restful in feeling. One of the hallmarks of Frank Lloyd Wright's architectural style is its use of strong horizontal elements which stress the relationship of the structure to the land. Vertical lines communicate a feeling of loftiness and spirituality. Erect lines seem to extend upwards beyond human reach, toward the sky.