Part of the office automata project. A newton's cradle made from card. The spacings need sorting out a bit and I reckon the hangers could do with being maybe 50% longer but the principle is there. Obviously it isn't going to work like a conventional Newton's cradle which rely on the inelastic collisions of steel balls. This one will rely on the centre ball being driven using a linkage in the framework.

Just noticed a scalpel blade lying on my desk in the picture. Must go and remove it before the cat sits on it!