A supervisor uses psychotherapeutic supervision for professional development, to provide support to supervisees, to monitor quality and as quality control for the profession. It also allows therapists to explore their client work more fully. Although, traditionally, it takes place as a conversation between the supervisor and supervisee, it has been argued that supervisors can use an array of creative techniques to enhance the supervisory process. Yet, there has been limited empirical research in this area. This qualitative study aimed to develop a deeper understanding of the use of creativity in supervision. Using a classic grounded theory method, this study aimed to discover a theory that identified and explained how supervisors account for their use of creativity in supervision. A pattern in the creative supervision approach of 13 experienced psychotherapy supervisors in the United Kingdom and Ireland was identified. The study revealed a main concern that supervisors had regarding their experience of using creativity and how they dealt with this. When supervisors were faced with a lack of clarity concerning the supervision issue in supervision, they experienced a block in their path to understanding what the issue was and how to assist with it. The ‘Revealing the Unknown’ theory explains (a) the purpose of the supervisor’s use of creativity in supervision as assisting in attaining sight of the supervisory issue and (b) the various ways supervisors manage a lack of sight in supervision. When supervisors experienced a block in seeing and understanding the supervisory issue, they used creativity to help the supervisee see more clearly, to cope with their own discomfort in not seeing the issue, to facilitate a sense of connection with their supervisee and foster greater understanding, thus attaining a more favourable supervisory encounter.