def insert(index, *args)
      args.each { |image| is_an_image image }
      current = get_current
      @images.insert(index, *args)
      set_current current
      self
    end
def insert(index, *args)
      args.each { |image| is_an_image image }
      current = get_current
      @images.insert(index, *args)
      set_current current
      self
    end
Initialize new instances