the function of the string is changing from a joining into a denial of separation. As a denial of separation spring becomes a thing in itself, something which has dangerous properties and has to be mastered.
Winnicott formulates the pivotal diagnostic distinction: string as symbolic joining belongs to healthy transitional phenomena, but when it becomes denial of separation it acquires an autonomous, potentially perverse character.
, The Maturational Processes and the Facilitating Environment, 1965thesis