I'm about to begin a big sci-fi project, and I've been reading up on a lot of Alex Senechal's works and blogs. He talks about these things called "Trim Sheets" a lot, which seem to just be flat planes with a ton of different details in them. They don't necessarily flow together though. It looks like it's just a collection of all of the details that he plans on using on a piece. I have folders of alphas and whatnot, and I was wondering, what exactly are these Trim Sheets, and how do people use them to modify their work? The main term I hear thrown around with it is modularity...where does that come into play? Thanks!