Mel Babcock Twin Cube Block Penetration: highest of quality
EFFECT: Two tubes are shown empty. A block and a plaque of thick plastic are both shown to be solid. The plaque is set atop one tube, and the second tube is set on the plaque above the first tube. The block is now dropped into the top tube. It penetrates the plaque and drops into the bottom tube. Both tubes may then be shown empty. Tubes are 8 inches tall.
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