The light in this stairwell at the Moses H. Cone mansion on the Blue Ridge Parkway made me think about “ray tracing”. Its a computer animation rendering algorithm that simulates the path particles of light take from the source angle as they bounce off various surfaces. I’m also reminded of Bob Heist’s lesson in Basic Photography at Randolph Community College back in the early 80s – “the angle of reflection is equal to the angle of incidence”.