All the creative activities involving writing - composing, programming and writing. Easy example, non fiction writers distill great quantities of information into a book or article. A composers work is (from this perspective) a distillation of the history of music (according to a semi-famous composer I worked with once). A program is fundamentally a highly complex algorithm - which is just a recipe to do something. A mental ability in other words, and when I program I have to distill large quantities of information into the final result. I trim ideas and approaches that don't work to find what does work.