A solid brass cabinet/drawer knob rests on a tri clover site glass fitting. The bird vibrates because it was preheated with a propane torch. The effect is similar to a Trevelyan Rocker.
If you put your ear close to the setup, you can hear a sort of precise rhythmic ticking that adds another perspective when it quiets down over the rattle. The bird came with one mounting screw which was used to try to augment the rocking motion.
TREVELYAN ROCKER
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