We present a digital twin-based Mixed Reality platform for arts curators. Despite the rising presence of exhibitions in varying digital formats, the virtual engagement of arts curators has been nearly disabled. To replicate and enhance the professional capability of arts curators in the virtual realm, our system integrates a digital twin art space and 3D authoring techniques, aided with spatial and semantic metadata. Our user evaluation proves the system's usability, and its capacity to support curatorial activities. With this, we aim to provide a groundwork to similar systems that also extend arts curator's creativity and outreach beyond time and space.