I made the bottom part of the "theatre" today. I have to confess that I was in some doubt as to whether this would work at all or not...
It did. This will be the part which holds and diffuses the perfume. Because of the dual nature of the challenge, I wanted a perfume which smelled like the earth, like soil and woodland and decaying plant matter. It surprised me to find that such a thing exists! Black Phoenix Alchemy Labs make it and the woman who runs the place was excited enough about the project to offer to send me a bottle of her "Black Forest" scent:
This is the captured scent of a cold, moonless night, lost deep within the darkest wood. Haunting and desolate, this scent evokes images of fairy tale tragedy and half-remembered nightmares. Thick, viscous pine with ambergris, black musk, juniper and cypress.