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

map 

        # Psych::Coder.map

(from ruby core)
### Implementation from Coder
---
    map(tag = @tag, style = @style) { |self| ... }

---

Emit a map.  The coder will be yielded to the block.

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.