Attic window is a traditional patchwork block composed of a square or rectangle window with frames on two sizes of the square. The fabric strips that create the window are joined with a mitre. The 'mighty mitre' is often viewed as a 'nono' for quilters. Many try to avoid this diagonal 'Y' seam because they assume it is difficult but it is an essential part of the attic window block. pb 16p c2009 ISBN 9780954092863