The practice-led project Sculpture as Activating Object, which has developed over three years, 2015-2018, investigates how a sculptural object activates a process of transformation through play. Sculpture activating describes how the process itself becomes the artwork. Through the investigation of three artwork case studies produced for this project, this thesis examines the different outcomes generated by the art objects and speculates that sculpture as activating object is a new category within the field of contemporary action-sculpture.