Inspired by the sticker contest and the response from mk and insomniasexx I've visualized a more precise Hubski logo. Refining mk and mike's definition of the logo:

The inner circle is only defined by the centerpoint of the logo. Assuming a value for the radius of the inner circle, draw two larger circles with the same centerpoint; one having two times the radius and the other three times the radius. The outer circles are thus defined as having their centerpoint exactly on the circle with the double radius, such that the outer circle would fit there with the same centerpoint as the small circle. The surface area of the outer circle is 1/8th that of the inner circle, so the diameter of the outer circle is 8sqrt(2)/π times smaller than that of the inner circle.

If someone wants the original Illustrator file, message me.

And here is the same image without the text. I think it looks quite nice: