"Men, too, secrete the inhuman. At certain moments of lucidit..." — Albert Camus quote meaning

Men, too, secrete the inhuman. At certain moments of lucidity, the mechanical aspect of their gestures, their meaningless pantomime makes silly everything that surrounds them. A man is talking on the telephone behind a glass partition; you cannot hear him, but you see his incomprehensible dumb show: you wonder why he is alive. This discomfort in the face of man’s own inhumanity, this incalculable tumble before the image of what we are, this “nausea,” as a writer of today calls it, is also the absurd.