That's a wonderful asset to the room. Your husband not only appreciates your work, but has a lot of good sense about decorating.
How did he figure out how to hang it so firmly to the wall? It appears to be attached top and bottom. Or, um, were you afraid to ask? I think if my DH took a notion to hang one without consulting me there would be some concern that he might try thumbtacks or sticky back velcro or who knows what! Rubber cement? Wallpaper paste? Hammer and nails? Railroad spikes?
