Synchro Boxes (T-237) by Tenyo

Effect: Show two boxes to your audience, allowing them to see the inside of each. The boxes appear to be more than a normal pair of empty boxes with sliding drawers. However … when you close the drawer of one box, the drawer from the other box mysteriously opens! To prove that there is no connection between the two boxes, you insert a playing card between them. The drawers still magically open and close as if by magic. For a surprising finish, the boxes are completely separated from each other, and they still move in sympathy with each other!

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