Since 2000, Angela Bulloch has developed Pixel Boxes, lit boxes programmed to generate, in a specific sequence, sixteen million different colours, such as on a computer screen. These boxes subvert the elementary geometry of minimalism with a spectacular aesthetic that brings to mind the world of pop and disco. Hybrid Song Box.4, is the final iteration of these "Pixel Boxes". These “hybrid” sculptures replace the screen displaying plain, changing colours with a plywood surface perforated with holes in a reference to a painting by the proponent of British Op-art Bridget Riley, White Disks 1 (1964), a pure composition of black circles on a white background. This time, the Pixel boxes were programmed in relation to beats and waves inspired by the soundtrack composed and played by David Grubbs, with whom the artist has created many pieces. For Hybrid Song Box.4, David Grubbs has arranged three mixes of the same music in a single loop – an electric guitar solo – processed by different feedback mixes. The light, colour and shape of the sculpture, and the sound interact and overlap. The artist explains this effect of transparency involving all the components of the piece: “I wanted this sculpture to reveal the elements that compose it both in terms of the form of the sculpture and in terms of its sound and visual production”.