Inception -Excerpt from a letter-

"Those who dream of the banquet may weep the next morning, and those who dream of weeping may go out to hunt after dawn. When we dream we do not know that we are dreaming. In our dreams we may even interpret our dreams. Only after we are awake do we know that we have dreamed. But there comes a great awakening, and then we know that life is a great dream. But the stupid think they are awake all the time and believe they know it distinctly." Chuang-tze

And of course the question remains: What difference does it make whether we dream or wake? Both in Inception and our butterfly Philosopher one experiences the same sufferings, the same joys, the same frustrations and anxieties whether the subject sleeps or wakes. Once again the Whole of a given life is a chimera (whether dreamlike or wakeful). It is rather the worlds of a subject which contain truths, mediated through the subjectivity of a subject (asleep or awake).

In other words, the movie ends at an appropriate moment (the top continues to spin and we do not find out whether it topples or not) not because it "keeps us guessing whether we're dreaming or not" (as the website suggests). The point is precisely that it no longer matters. The subjective truths conveyed by the main character finally meeting his children subsumes all other concerns. This is the ultimate truth of the scene. The top represents the Whole of the situation (the possibility of Wakefulness or Fantasy) which is abruptly cut off (cinematographically) because it no longer represents the Real of the situation (the -subjective- localization of the truth of the power of Love). We could say that ultimately we are indifferent to the top. It's being (and representative function) cease to exist from the point of view of the subject, hence, its banishment from sight without further consideration. Whether it stands or falls, it is no longer considered a site of truth for the subject.