I found an other rather nice transparent object at my flat. Its a Galileo thermometer. So what was more obvious than give the Dekolicht a try ;-)

I added a hallswitch to the Atmegahearth. I was lazy and put toghether the "Basic ApplicationCircuit #1: Only Pull-Up Resistor is necessary". Can you spot it? ;-)

For completeness the other side:

and for completeness... how thick it is.

With room lightning and near white Setting And a few shots without room lights.