I am the kind of person that tries to learn something from anything, or tries to find anything from something. This is an example. For me, it tells everything about the simplicity and usability of the applications we create. Keep your user interface, your application flow, as simple, straight forward, and easy to use as possible . Of course, not all application can be as simple as the first two figures on that web page, so there is a trade off between simplicity and usability versus expressiveness and efficiency. What I think that one should leave with after viewing the three figures is that we should always try to remove the unnecessary complexity from our designs (or just take those drawings as a comic and smile).