Ruby Object explained

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 Every class has Object — and therefore Kernel and BasicObject — among its ancestors.
 Of course, there’s still the paradox that BasicObject is an Object, and Object is
 a Class, and Class is an Object. But as you saw earlier, a bit of circularity in the class
 model serves to jump-start the hierarchy; and once set in motion, it operates logically
 and cleanly.

from

 http://www.manning.com/black2/SampleChapter4.pdf