The tool mentioned in your question seems to be referring to a specific artistic concept or tool, but since there is no specific tool mentioned, I can't pinpoint exactly which element of art it pertains to. However, I can give a brief overview of the elements of art:
- Line: Refers to a mark made by a moving point.
- Shape: Refers to a two-dimensional area with a defined boundary.
- Color: Pertains to the hue, saturation, and brightness of objects.
- Space: Refers to the area around, between, and within components of a piece.
If you provide more context about the tool, I can help identify which specific element of art it would assist an artist in understanding.