Canonical, the company behind ubuntu, thought of making an interface similar on any device, irrespective of its hardware limitations, or rather, screen size. This bore the idea of convergence.
that is to say, the power of any particular device is to be made equal with only the difference being the screen size and, a bit of ways of interaction. This is a reality that has made it possible for the comapny to build very interactive:
All the above, boasting the power of convergence.