Design Principles: Line
Line is the underlying principle driving Art Nouveau. Lines can be delicate or aggressive, directional or meandering, representational or abstract. Lines do much more than delineate a shape. They have rhythm. They have motion. They can fill space or create negative space.
Vertical lines draw our eyes upward like tall trees and make us feel uplifted. A horizontal line feels calm and at rest. A diagonal line is the most energetic and suggests movement.
Sometimes a row of objects creates the impression of line that is not actually there. Where two fields of color meet also implies a line.