Carmen Herrera Red Square
The Constructivists - El Lissitzky - "The story of the little red square", Children's book design
Karel Martens & David Bennewith for the Architectural Association, 2007
Designed by John Massey
Colorful square pattern background collection - 50+ vector backgrounds (EPS + JPG)
I chose this as a representative of shape in design because the gradually decreasing line weight and the curvature and softness of the edges creates a visually appealing and playful piece.