thank you for your answer, the final result that I want to get it is like a stained glass just in projecton a light.
if you see what I want!
like this ! but only with light
Hello, I'm wondering if you can inform me about that kind of light which be projected on a glass and it helps us to see it's reflection only for the viewer and not for anyone the other side .
all proposals and methods are welcome.
even if it is necessary for the light to pass on a chemical...