How does labanotation identify which body part is moving?

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In labanotation, the identification of which body part is moving is determined by the placement of symbols on a vertical three-line staff.12

This staff represents the performer from their own point of view, with the center line dividing the staff into right and left columns. The specific column in which a movement symbol is placed indicates the corresponding part of the body in action. While the main columns represent primary body parts, families of additional signs are used to denote minor body parts, and further details modifying the action can be indicated by symbols such as pins and hooks.12