The technicality of piecing is a catharsis for me. I work to make things as neat as possible, then remind myself (and students) that we're working with fabric, not stone -- it moves and has give and is like a living thing. After one re-do, let go and move on.
That catharsis part? .....maybe that's why I have so many UFOs....I enjoy the piecing part much better than the finishing.
