First, building a structure isn't like that easy. There are many small details that you don't see in the picture or video that need to be added to the build. If you don't line up the blocks perfectly, the balls will get stuck. In addition, the rocking chair does not stand still. After he drops his ball stash to the side, the crank will slip off the ledge and if you don't get it back quickly, the balls won't be able to drop it again. The pieces fit together like blocks with a small ledge for support. Trouble is, if you have an overly enthusiastic kid (or a marble-obsessed cat), the slightest hit will destroy the entire structure. Make sure the swing snaps back into place (don't hit it) and the blocks don't twist in the slightest to keep the balls flowing.
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