ct This chapter discusses two applications aiming at evolving images in the styles of two well-known Dutch painters: Mondriaan and Escher. For both cases we have an evaluation criterion based on "style-fidelity". This makes the (subjective) selection less free than in applications solely aiming at nice images. Technically, the Mondriaan evolver is less difficult, given that his style "simply" uses rectangles filled with a single color. The Escher evolver project is more challenging. First, because Eschers style is less simple to capture. Second, the system is to be implemented in vivo, in a real museum, posing requirements on the interface. We describe how to meet the style challenge based on the mathematical system behind Eschers tiling. Designing a suitable representation and the corresponding variation operators based on this system specifies an appropriate search space guaranteeing the Escher style to some extent and leaving enough freedom for the selection. As ...
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