This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# PrettyPrint.genspace (from ruby core) --- A lambda or Proc, that takes one argument, of an Integer, and returns the corresponding number of spaces. By default this is: lambda {|n| ' ' * n}
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.