The object I use is very simple : a cardboard box, the outside is painted in black, the inside painted in white.
A neon the width equal to the box is suspended inside.
A little hole on the top of the box, let just the objective of the camera pass through.
In the box I animate black shapes and letters, some black paper cuts, some drawings on paper or transparent film.
The camera records, over-exposes it, amplifies the contrast, and adds a negative video effect before the image signal goes to the video-projector, on the scene, with Simone.
If you want to know absolutely everything, you can look at this page, it's the entire process and discussion.