child f():
 this: _level0.clip
 _target: /clip
 getDepth: [type Function]
 foo: child foo

child obj toString:
 this: object
 _target: /clip
 getDepth: [type Function]
 foo: child foo

clip.f():
 this: _level0.clip
 _target: /clip
 getDepth: [type Function]
 foo: child foo

_root f():
 this: object
 _target: /
 getDepth: 
 foo: 

root obj toString:
 this: object
 _target: /clip
 getDepth: [type Function]
 foo: child foo

