# File lib/cairo/paper.rb, line 31
      def parse(paper_description, robust=false)
        case paper_description
        when Paper
          return paper_description.dup
        when Symbol
          paper = resolve_constant(paper_description)
          return paper.dup if paper
          raise UnknownPaperName.new(paper_description)
        when String
          paper = resolve_constant(paper_description)
          paper ||= parse_size(paper_description)
          return paper.dup if paper
        when Array
          return new(*paper_description)
        end

        raise UnrecognizedPaperDescription.new(paper_description) if robust
        nil
      end