Earthworks is a category of mixed-media that relies on using natural materials and assembling them into forms of the artist’s conception. It is also a non-destructive and environmentally conscious means of creating art that simply disappears back into the natural environment. The most famous exponent of this method of work is the Scottish artist, Andy Goldsworthy.
Andy Goldsworthy at work.
You might be familiar with the piece he did for the deYoung museum based on the San Andreas faultline.
This piece was done by an artist who used colorful stick on labels throughout a room.