I found the explanation "All types implement the empty interface".
https://golang.org/ref/spec#Interface_types
So an empty interface also implements an empty interface? and again the 
empty interface implements an empty interface and the empty inter.......
What I imagine is like this below.
                  :
                  :
                  :
       empty interface
                  |
       empty interface
                  |
       empty interface
         |        |          |      
       int  float64  bool

In java, Object class is the top.
      
            Object
                 |
            Creture
             |        |
      Animal   Human
       |       |
    Dog  Cat

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