Basically this is a Raspi Pinhole camera / camera obscura. It's a bit of a mix between the two. The image is produced by light from outside the vessel projected onto the wall of the vessel.
But it is read by the camera inside the vessel, so technically i guess this is a camera in camera (obscura). Anyhow - it works quite well and the image it produces is quite magical (to me - at any rate.)
More images and installation shots coming soon.