It seems like you might be referring to a specific tool, but I don't have details about it. Different tools can help artists understand various elements of art, such as:
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Color Wheel: A tool used to understand color theory, including complementary, analogous, and triadic color schemes.
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Ruler or Straight Edge: Helps artists understand line, shape, and perspective.
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Canvas or Sketchbook: Provides a space to explore composition and space.
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Value Scale: A tool to understand light and dark, helping with shading and creating depth.
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Proportional Divider: Helps with proportion and scale in drawing or painting.
If you provide the name or type of tool you're referring to, I can give a more specific answer!