A Day Diffracted (Jan. 2011)
Rules: the piece was to be constructed out of samples from this zip file (great sounds there!). I had to use the recording of Marc playing the first movement of a Beethoven piano sonata, Op. 109; I also had to consider the piece's title before working; beyond that, I was allowed to do whatever.
**Also, as a kind of footnote to this piece... while I was working on putting it together, my friend Iris Alden (who has done loaaads of wonderful album art for me) posted this watercolor image on her blog, which seemed to me to be somehow a kind of continuation/deconstruction of the visual ideas I was in the process of responding to... so I did a "realization" of it, too (though adhering to its form less strictly)--again using the Beethoven-via-Marc samples that I used throughout A Day Diffracted.
Shape Play (Oct. 2010)
Marc sent this to me back in October. It doesn't have any rules (though I do try to follow the shapes). The image below is just the first page--follow along with a pdf of the whole score here.