Six different colored blocks are secured in a box by a spike.
Remove the spike freeing the blocks and dump them on the table.
Two colored blocks are selected by the spectator, and then all the blocks are placed back in the box.
Close the box and insert the spike through the blocks. You can see the blocks at all times through the holes in the lid.
The box is turned over and the lid opened. The two pre-selected blocks fall to the table!
Repeat the effect in reverse : Selected blocks remain on the spike and four blocks fall out!
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