It's a very post modern oriented app, and I really love postmodernism theories so I guess i like that app too.
The idea of the post modern theory, and way of thinking, is that there is (some would say - ALMOST) nothing definitive. things are what the viewer see they are - and if one decides to see them in a certain way - than for him it's solid reality.
So in our case, if one has a day some would say is definitely a bad day, objectively so - according to that theory, the person can - by his interpretation, by the way he sees things - make this day into a totally happy and good day, because where does that day exists now that he is over? only in our memory - and if that person remembers that day in certain way, a good one - that the existence of that past day become good - and it's a reality and not an illusion. You might think that it requires a twist of the events so they will fit what we define as "good", but it's not so - it's a post modern thought remember? so if the person sees it as good - that's all that matters, without interpretation according to our regular standards.
Now - with that app you can implement your good interpretation in somthing more solid than the "thought" itself, and it can be kinda cool and encouraging!
Thanks for that lovely post @cryptoctopus !