Need to prevent small rock carvings from falling out of hanging curio

Terri
by Terri
I have a very cool, small wooden hanging curio that I bought to hold small carved rock fetishes. The curio doesn't have a door or ledges on the display spots that might prevent the items from falling off their respective shelf. It's just a dollhouse shaped bunch of different sized spaces. It is only about 2 inches deep. Anyone have an idea of what I can do to keep my collection from falling off their "shelf" in the hanging cabinet? I thought I might have to run fishing line across each level but I don't think it would look good unless you can think of something. I also thought about putting Velcro on each little shelf but I cannot glue anything to the carvings as they are signed carvings. I appreciate any thoughts & nothing would be silly.
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