This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Method.receiver (from ruby core) --- meth.receiver -> object --- Returns the bound receiver of the method object. (1..3).method(:map).receiver # => 1..3
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.