# File lib/RMagick.rb, line 1317
    def is_an_image_array(ary)
        unless ary.respond_to? :each
            Kernel.raise ArgumentError, "Magick::ImageList or array of Magick::Images required (#{ary.class} given)"
        end
        ary.each { |obj| is_an_image obj }
        true
    end