There is something intrinsically photographic about green houses, I think. The transparency of glass provides a natural depth to the image. Reflections and diffusion of light are also provided free of charge. Plus, you can see how the structure is put together. Remember the 'Visible Man' kits? At the moment, we are having a new roof added to our home. Looking up, we can sometimes see the sky. It is a bit like being an exotic plant (personal preference) in a glass house.
Tasting notes: Olympus Pen FT, Ilford FP4+.