Well the definition of surrealism is pretty self explainatory, just look at the name.. above realism, as in it's above and beyond what is realistic or realisty. It's just way out there. It's generally a tool to make people 'think' but there's plenty of mindless surrealism abound.. see my most recent image. Abstract is generally just shapes and colors.. and I don't really understand it but that's just my taste. The funny thing is, fractals are generally considered to be abstracts, while they are some of the most mathamatically strict 'renders' out there =), just goes to show you what a 'definition' will get you.