The light frieze forms part of the new building of Kunstmuseum Basel – the Basel Fine Arts Museum –, which was formally opened in 2016. It consists of an LED-based light installation, in the form of a band 3 metres high and 115 metres long, which encircles the building at a height of 12 metres. By contrast with other media façades the frieze, which comes across as a symbiosis of stone and light, has an actual physical presence and constitutes an integral component of the architecture. Making a sophisticated use of the existing horizontal structure of joints, it projects a subtle display of texts and patterns onto the skin of the building, creating the impression of a fleeting play of light and shadow. The LEDs inserted in the joints cannot be seen from the street. They respond dynamically to the changing light situation in the course of the day. Conceived as a media membrane, the light frieze amounts, in both technological and aesthetic terms, to an extrapolation into the digital age of an architectural element that has been familiar since antiquity.