The inside of the box is empty. This is unexpectedly interesting. 

First, the blocks were made into a box structure, with a weight inside, and the weight could be moved to the end and center.

When the weight is in the center, it can be used as an ordinary block, but when the weight is moved to the edge, the control changes.

Blocks can be stacked unstably. To be precise, it is interesting that "the search for an unstable-looking way of stacking "is generated.

The resulting figure is beautiful enough to stand up as an artistic object for the interior. 

The best recommendation is to shape with natural objects. 

In the unbalanced structure, the beauty of nature stands out.