What is ‘dark matter’? For theoretical physicists it is matter that cannot be directly observed but whose existence is nevertheless scientifically calculable – productively present yet simultaneously invisible. In a similar vein, the everyday phrase ‘dark matter’ describes objects, conditions and situations that harbour unease or trauma. Trauma that is often concealed, repressed, or buried. Both definitions are active in Ann Shelton’s mid-career review exhibition Dark Matter, and they provide a rich point of entry into this compelling collection of her photographic work. These are photographs that bristle with intensity and refuse to let their subjects die a quiet archival death.