I’m general, I wouldn’t rest anything actually against a wall that involves moisture… even if there were a way of to not have theater pass through, you’ll create an area of condensation. What you may be looking for is something freestanding… think of those desktop water falls that bubble over a wall… basically a trough with a pump. There is a bunch of you tube devoted to these sort of things… even like a contained shadow box or curio cabinet might be a good option. It is easy to underestimate how drying even a gentle breeze will be on any sort of exposed moss wall.
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