# File lib/rvg/embellishable.rb, line 355
        def rvg(cols, rows, x=0, y=0, &block)
            rvg = Magick::RVG.new(cols, rows, &block)
            begin
                x, y = Float(x), Float(y)
            rescue ArgumentError
                args = [cols, rows, x, y]
                raise ArgumentError, "at least one argument is not convertable to Float (got #{args.collect {|a| a.class}.join(', ')})"
            end
            rvg.corner(x, y)
            @content << rvg
            return rvg
        end