I think in messy pictures. Strangely, the pictures are as poorly drawn in my sloppy style as they are on the page. For example, a loop is an ugly circle with

I think in messy pictures. Strangely, the pictures are as poorly drawn in my sloppy style as they are on the page. For example, a loop is an ugly circle with a downward facing arrow on the right side and it looks just like something I would have drawn. Object stuff tends to look UML-like and functional stuff tends to look flowchart-like. And they are messy whether in my head or on the paper. When I need words, they usually look like/start to follow the conventions of the language I'm planning to write the code in.