James Joyce says

My head is full of pebbles and rubbish and broken matches and bits of glass picked up ’most everywhere. The task I set myself technically in writing a book from eighteen different points of view and in as many styles, all apparently unknown or undiscovered by my fellow tradesmen....

Emotion has dictated the course and detail of my book, and in emotional writing one arrives at the unpredictable which can be of more value, since its sources are deeper, than the products of the intellectual method. In the intellectual method you plan everything beforehand. When you arrive at the description, say, of a house you try and remember that house exactly, which after all is journalism. But the emotionally creative writer refashions that house and creates a significant image in the only significant world, the world of our emotions. The more we are tied to fact and try to give a correct impression, the further we are from what is significant. In writing one must create an endlessly changing surface, dictated by the mood and current impulse in contrast to the fixed mood of the classical style. This is ‘Work in Progress’. The important thing is not what we write, but how we write, and in my opinion the modern writer must be an adventurer above all, willing to take every risk, and be prepared to founder in his effort if need be. In other words we must write dangerously: everything is inclined to flux and change nowadays and modern literature, to be valid, must express that flux.... A book, in my opinion, should not be planned out beforehand, but as one writes it will form itself, subject, as I say, to the constant emotional promptings of one’s personality.