I have recently been reading Chris Drury's book, Silent Spaces. He is a land artist creating works in site specific spaces. His body of work includes ephemeral assemblies of natural materials, in the mode associated with Andy Goldsworthy, as well as more-permanent landscape art, works on paper, and indoor installations.
Some of Drury's lasting works are "cloud chambers", darkened caverns constructed of local rock, turf, or other materials. Each chamber has a hole in the roof which serves as a pinhole camera; viewers may enter the chamber and observe the image of the sky and clouds projected onto the walls and floor. On paper, he uses a variety of unusual media---notably mushroom spore prints, dung, and peat---as a source of color and patterns, which he might overlay with text or fingerprints, or underlay with maps or other geographic images. More recently, Drury has produced works associated with the body, working in residence with hospitals and incorporating echocardiogram data and blood into his art.

Chris Drury - Silent Spaces. Book