... or horizontal?
The other day as I was putting it away I noticed the back of the quilt, with a little detail that I thought might be helpful to share.
When I made the piece several years ago my first idea was to have it horizontal, and that's the way I put the sleeve on. But for some reason I subsequently decided that it would also look good in the vertical orientation. So I put a second sleeve on.
Because each sleeve is sliced off on the diagonal, you can insert a hanging rod in either direction and still have it support the entire width of the quilt.