Hanna Segal's original paper in 1957 on symbol-formation is a classic. It makes clinical observations of concrete symbolic equation and theorized the contrast with normal representation. In the process of developing the most accurate and most useful theory of symbol-formation that psychoanalysis possesses, Segal brought the psychoanalytic symbol into connection with the wider meaning of symbols in linguistics and other academic disciplines. It is less well known that she modified the theoretical conceptualization of her observations in the light of Bion's development of the theory of container-contained. Perhaps because of the clinical usefulness, little serious criticism has been made of either the original theory or its modification. In this paper, an appraisal will be made of these major conceptualizations. This paper looks again at the theory she used to make the distinction between normal symbols ‘proper’, or representations, and the concrete symbolic equation associated with the primitive or psychotic defences.