gistfile1.rb

require 'celluloid'

class HelloSpaceActor
  include Celluloid
  def say_msg
    print "Hello, "
    Celluloid::Actor[:world].say_msg
  end
end

class WorldActor
  include Celluloid
  def say_msg
    print "world!"
    Celluloid::Actor[:newline].say_msg
  end
end

class NewlineActor
  include Celluloid
  def say_msg
    print "\n"
  end
end

Celluloid::Actor[:world] = WorldActor.new
Celluloid::Actor[:newline] = NewlineActor.new
HelloSpaceActor.new.say_msg