Illustration of class methods and instance methods (I think!)

gistfile1.txt

irb(main):001:0> class A
irb(main):002:1> def self.cow
irb(main):003:2> "hello I am a cow"
irb(main):004:2> end
irb(main):005:1> def moo
irb(main):006:2> "Mooooo!"
irb(main):007:2> end
irb(main):008:1> end
=> :moo
irb(main):009:0> A.cow
=> "hello I am a cow"
irb(main):010:0> A.moo
NoMethodError: undefined method `moo' for A:Class
	from (irb):10
	from /Users/melissakaulfuss/.rbenv/versions/2.3.1/bin/irb:11:in `<main>'
irb(main):011:0> talky_cow = A.new
=> #<A:0x007fdc3382c370>
irb(main):012:0> talky_cow.moo
=> "Mooooo!"
irb(main):013:0>

A.class
=> Class

A is a class of the superclass class?

talky_cow.class
=> A

talky_cow is an instance of the A class?