week5_exe2_2.rb

class Shape
  def rotate
    'Rotating around the center of ' + self.class.name
  end

  def play_sound
    "I am playing the sound #{self.class.name}.aif"
  end
end

class Amoeba < Shape
  def rotate
    'I am rotating around a end point!'
  end

  def play_sound
    'I am playing the sound amoeba.hif'
  end
end

Square = Class.new(Shape) # -> this should return an instance of Shape
#Square.rotate #-> so, I was expecting that calling rotate here would work. But instead it doesn't.
puts Square.new.rotate #-> I am forced to call Square.new everytime .... why?
puts Square.new.play_sound