The circle as the king of flat design

One interesting aspect that we can notice about flat design interfaces is the recurrent use of circular forms. When circles and circumferences are employed to compose interface widgets, they seem to express time effectively without the necessity of more visual information.

We cannot escape from the metaphor

Metaphors and metonymies are the two more used rhetorical figures in HCI. Will we be able of getting rid of metaphors and metonymies in HCI design and experience design ever?