: In reasoning tasks like those found in VBVR-Wan2 , labeling something as a "solid piece" helps the model predict collision outcomes, spatial configurations, and structural complexity.

The video file serves as the "" for a specific task instruction, showing the complete solution trajectory of how these solid objects interact. A Very Big Video Reasoning Suite - arXiv

In the context of this dataset, a "" generally refers to an object's physical property within a simulation or reasoning task. Specifically:

: It identifies a single, unified object that does not break apart or change its structural integrity throughout the video.