This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

=== 

        # Module.===

(from ruby core)
---
    mod === obj    -> true or false

---

Case Equality---Returns `true` if *obj* is an instance of *mod* or an
instance of one of *mod*'s descendants. Of limited use for modules, but
can be used in `case` statements to classify objects by class.

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.