Last month I posted a photo of a construction site where a building in which I once worked had been demolished. The adjacent building in the same block had a series of nine ceramic murals which I never paid much attention to, in spite of passing them probably thousands of times. I'd have almost certainly forgotten all about them if my former workmate Keith hadn't let me know that they had been relocated to the Barbican complex, and today I went there (on the level 2 walkway beside Speed House) for a long overdue closer look. I learned that in 1960 the building for which the murals were commissioned had been London's largest telephone exchange, and the artist Dorothy Annan had taken her inspiration from the telephony hardware housed inside it. So thank you Keith, for sharing, as we used to say, and thank you Dorothy. I wish I'd learned about your story years ago.