Watch this video: Sentient Sketchbook Demonstration (with Captions):
Read this paper: Search-based Procedural Content Generation: http://julian.togelius.com/Togelius2010Searchbased.pdf
Read this paper: Sentient Sketchbook:Computer-Aided Game Level Authoring
Answer the following questions in your own words. You can (and should) use quotes from sources if they're relevant, but your answer should not consist entirely of a quote.