I am generating a list of tangents based on the radial rotation of the geometry in each circle and trying to drive the gradient based on the angle. However, it doesn’t seem like I’m sending the right inputs into the gradient even though the output looks sort of right.
The reason I am using tangent is to bring the series of rotations back into the unit circle range.
I am also going to drive the radius of the circle based on the rotation angle.
unnamed v1 rebuild.gh (40.5 KB)
I think the issue was with the Gradient component: Lower Limit and Upper Limit have default values of 0 and 1
in this case you have tangent values ranging from -9 something to +9 something, so need to instruct the component to generate colors in that range
unnamed (2)_Re.gh (26.8 KB)
in general, I would also suggest to use the Range component to generate range of numbers equally distributed inside a Domain (you’ll be getting the very same result as with the Series, but using less components, and probably in a less “weird” way 
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