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What is the difference between the two circles in the rotation tool in Unity?

In 2D rotation tool there are two circles which allow to rotate an object. And I can not conceive a difference between them. Could someone explain me what is the purpose of having both of them? It seems they both do the same.

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  • \$\begingroup\$ Have you tried looking at the widget in 3D, not only in 2D? \$\endgroup\$ – DMGregory Mar 16 at 21:08
  • \$\begingroup\$ @DMGregory, your comment explains the purpose of the three circles: green, red and blue. Thank you for that. But what about the outer white circle? \$\endgroup\$ – some1 here Mar 18 at 20:05
  • \$\begingroup\$ Did you try using the yellow-white circle in the 3D view? \$\endgroup\$ – DMGregory Mar 18 at 20:08
  • \$\begingroup\$ @DMGregory, oh. That helps. So, the white circle is for a rotation relative to the current scene view. Right? \$\endgroup\$ – some1 here Mar 18 at 20:14
  • \$\begingroup\$ Want to post an answer with the results of your observations? \$\endgroup\$ – DMGregory Mar 18 at 20:22
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After the comments provided under the question I was able to grasp the idea of the circles. There are four circles. Three of them are used to rotate around x, y and z axis and the fourth is used to rotate relatively to the camera which is used during the scene management in editor.

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