The term "flexible art" applies both to the design as well as the modular nature of many of the images in the Arts & Letters EXPRESS clip-art collection. When creating the clip-art, consideration was given to the most adaptable perspective of an image. A single image of a Spitfire can be easily manipulated using size and rotate to create the illusion of movement. P-51D Mustang    P-40 Warhawk    Ju.87 Stuka    F-14 Tomcat    AV-8B Harrier