The display of Dafydd 's virtuosity in this technique has been seen as his prime motivation for writing the poem .
Sometimes Dafydd used dyfalu pejoratively ; less often , as in this poem , to express his wonder at one of the great forces of nature .
The display of Dafydd 's virtuosity in this technique has been seen as Dafydd 's prime motivation for writing the poem .
Sometimes Dafydd used dyfalu pejoratively ; less often , as in this poem , to express his wonder at one of the great forces of nature .