Ant it's a very simple epistemology. This world I can touch and likewise judge that it exists. There ends all my knowledge and the rest is construction. Between the certainty I have of my existence and the content I try to give to that assurance the gap will never be filled. So for Camus one finds that life has value but no meaning.
Meaning implies some sort of goal, some teleological approach, and, for Camus, there is no goal.
Life is not a pilgrimage, death is not an open door, but it is a closed and blank wall which functions finally, of course, to force us to concentrate on life. But Camus concentrates on the other meaning which comes from the root. There are many examples in literature of this particular kind of silence. Lord Capulet orders Juliet to marry Count Paris. She protests, to no end.