Prince Rupert's Pearls

A droplet of molten glass is displayed. Its hardness is tested by receiving several blows from a small mallet. The performer now uses the audience in an experiment in which their thought waves are used collectively. As the performer focuses their energy on the droplet, it suddenly shatters with a loud report, into a million fragments. The glass droplet actually explodes under the pressure of their mental vibrations! In the original box, includes the instructions. Bag unopened, mint condition.