Fig. 1

Screen displays of an EvoSketch simulation at the beginning (left) and during the 7th generation (right). The main box shows the offspring line (black) drawn (with a mouse or finger) from the parent line (grey). After saving the line, it is visualized in one of the four offspring boxes (offspring 1–4). To the right of the main box are displayed all offspring lines that have been generated and saved so far. The red framed boxes show the offspring selected as parent lines for successive generations. The red dot (only seen after pushing the button show point) serves as a selection factor. The offspring line that is nearest to the dot (indicating optimal fitness for the surrounding environment) is selected as the new parent line