Bas relief panel on stand

I should have taken a picture of this item with a light shining behind it because the negative bas relief carved into it becomes a fully dimensional scene in front of a light. It is a beautiful picture, I think religious, maybe of Mary holding her child. I have never seen one of these and I wish I could remember what my mother told me about it. I have always loved it.
Any info would be greatly appreciated!
I don't even know how to categorize it!