SmartPainter generates images and prompts the user rate the beauty of these images. Once the images have been rated, more random images are generated in a style similar to the ones that were rated most beautify, and the process is repeated. SmartPainter uses Genetic Programming and a Lisp dialect (the 'lithp' Lisp interpreter). SmartPainter programs use the Lisp syntax, but make use of many custom-made commands, such as (line 30 20 40 199) to draw a line.
