precedent

I found this precedent for myself in the Wall Street Journal.

It's the "Visiting Artists House" by Jim Jennings Architecture.

The building – on the crest of a hill at a former sheep ranch that is now home to commissioned sculptures by Richard Serra, Bruce Nauman, Ursula von Rydingsvard and others – is a bipartite residence for artists on site. Two seemingly parallel poured-in place concrete walls cut through the hill, diverging at the north and converging at the south. The stepped floor creates a shifting section through the length of the building to accentuate the perspectival phenomena of elongation and foreshortening of space. A site-specific, expansively gestural work by David Rabinowitch is carved directly into the inward-facing surfaces of the concrete walls, concert and in dialogue with the architecture.
http://www.jimjenningsarchitecture.com/index-start.htm