def images
      images = @anchors.select { |a| a.object.is_a?(Pic) }
      images.map { |a| a.object }
    end
def images
      images = @anchors.select { |a| a.object.is_a?(Pic) }
      images.map { |a| a.object }
    end
An array of image objects that are associated with this drawing's anchors
 @return [Array]