Traditional reverse glass painting is completely opaque and this is something I always tried to overcome. This piece here still is opaque, the transparency you have while working on it gets lost when you finish the painting. Its meant to hang on a wall, not in a window for instance... In my more recent works I was actually able to preserve some of that transparency. "Journey I" is an early example for that.
This piece here is left completely "open" and you can see the wall through it.