The universal phantasy of having a twin originates in our earliest relational experiences. This book is about twins and twinning processes. The existence of an actual twin, alive or dead, may be experienced as an embodiment of the phantasy of having a twin, with developmental consequences. Twinning processes in twins lead to the creation of an internal twin relationship that is enduring. The twin relationship may be at the narcissistic end of the spectrum leading to an enmeshed twinship, or it may be a more mature object relationship. All twin relationships will be manifest in the...