It's a course on symbolic programming that builds on 6.034 (AI). The lectures aren't open but the same information is all in the suggested reading as you go through the problem sets. Build things like a compiler for a DSL, pattern matching and decision making programs, experimental parallel concurrency through message passing 'actors', most of it is exploratory programming and lot's of SICP/GNU Scheme documentation reading http://groups.csail.mit.edu/mac/users/gjs/6.945/index.html