Bowing tool for beginners...

I don't know what it is called, but you can make something like it easily. Take a length of a guitar's low e string. Stick wine corks on both ends, and insert in top of f holes making an arch over the strings. Bow between the wire and the bridge. If you touch the wire, it will rattle a bit. Diana Gannett uses something like this for some students, but with a tightly wrapped spring instead of a guitar sting. Maybe it rattles louder.

Your eyes will do the job just fine, though.
 
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