Two

Meursault does a series of actions which seem to be out of routine and custom. He attends his mothers funeral and is constantly stating that he feels he should..., or he feels guilty..., or he feels it's custom to... and so on. This gives a sense of a lack of emotion, that nothing he has done so far has much meaning to him, and he has no sense to think about his effects of his future. Camus does this to get the reader questioning Meursault, because the reader is not emotionally connected to him (yet).