This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# NilClass.nil? (from ruby core) --- nil.nil? -> true --- Only the object *nil* responds `true` to `nil?`.
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.