While much contemporary therapy emphasises the importance of establishing a sense of safety, depth psychological traditions spoke instead of containment. Informed by their experience of gender transition and of kink/BDSM practices, as well as Winnicott, Bion and Jung, therapist and Trans Sex author Lucie Fielding discusses fear, risk, play and states of therapeutic chaos – and suggests clinicians should aim instead to offer clients an experience of ‘boundedness’.