When I first started quilting (last November), the book I read said that the border was the frame to the quilt and only discussed plain borders (with different methods of doing the corners).
Only recently, I've become aware that they could be pieced.
So, are borders the frame (or matting and frame if you use a double border) or are they part of the design or a complementary design? How did you know if you need a border or what type of border to use?
The more I learn about quilting, the less I seem to know.