"Downward anon to the valley rebounded the boulder remorseless; and "
"The (bitter) arrow flew; "
and
"Flying on eagerly; and "
Stuck in the earth, still panting to feed on the flesh of the heroes; and
"And the point of the spear in its fury drove
"full through his breastbone. "
In all these examples the things have the effect of being active because they are made into living beings; shameless behaviour and fury and so on are all forms of activity. And the poet has attached these ideas to the things by means of proportional metaphors: as the stone is to Sisyphus, so is the shameless man to his victim. In his famous similes, too, he treats inanimate things in the same way:
"Curving and crested with white, host following
"host without ceasing. "
Here he represents everything as moving and living; and activity is movement.