Initially the red button icon was there to alert the user that they can "RELOAD" the original graph data. The "clockwise" motion indicates "reload" in my view.
As things progressed, I decided to implement a single UNDO scenario, and thought "why not use the same button"?
Programmatically this works fine, except that now UNDO looks not necessarily correct. Undo should look anti-clockwise?
The example above shows at the bottom, a mirror image of the red button (anti-clockwise).
So, the question is, which one to go with?