In the spirit of 'sometimes the simple answer is the correct answer'; they are hung with picture hangers and wire. It was done this way to make it easy to expand the collection.

Sometimes you get real dumb questions! This bathroom, has a real "feel" about it. Just love it. Really find the who room fits together beautifully. I don't think I'd care if there were 12 or 18 masks there. It's irrelevant, use your head. Oh, then you'd have another mask.....

This video explains how to use a kit. For a mask you would get a plastic wash tub and fill it with dry beans and settle the mask in so it is stable so you can use the kit parts. After you are finished with the beans you can make a soup. Jedanna, still being a **** I see.....

Theresa Holt, thank you for recognizing an *** when you see it.