Brilliant! Please try to find on CUMINCAD or by contacting the editors of the ACADIA 2009 conference (www.acadia.org) the following paper:

“Adaptive Fritting as Case Exploration for Adaptivity in Architecture.”
The authors used a simple mechanical device to shift layers of patterned
glass relative to each other to vary not only the proportion of transparency
(for possible thermal or day-lighting considerations) but also the apparent
pattern of the surface. It was quite remarkable how simple patterns on the
individual layers would produce intricate designs when they were shifted.
Of course, they had a simple computer graphic application to preview the
effect before building it, but they also explored the actual construction
of the things.