What writing a thesis is like...

Putting a book together is interesting and exhilarating. It is sufficiently difficult and complex that it engages all your intelligence. It is life at its most free. Your freedom as a writer is not freedom of expression in the sense of wild blurting; you may not let rip. It is life at its most free, if you are fortunate enough to be able to try it, because you select your materials, invest your task, and pace yourself. In the democracies, you may even write and publish anything you please about any governments or institutions, even if what you write is demonstrably false. The obverse of this freedom, of course, is that your work is so meaningless, so fully for yourself alone, and so worthless to the world, that no one except you cares whether you do it well, or ever. You are free to make several thousand close judgment calls a day. Your freedom is a by-product of your days' triviality. - Annie Dillard, The Writing Life, page 11

 Annie Dillard puts it so well. It is "interesting and exhilarating", "engages all your intelligence" and "life at its most free" yet not that free because we want to produce something for the benefit of not just the writer, but all for his or her audience. :)