Martin Bricelj Baraga’s latest Cyanometer (2016–) is unveiled in front of Geneva’s Museum of History of Science, the very institution that keeps Horace Bénédict de Saussure’s original instrument from 1789. Fourth in a growing network of distributed public sculptures, Baraga’s reflective monolith measures (and archives) the blueness of the sky as well as air pollution, allowing for comparative analysis between the cities of Ljubljana, Wrocław, Dresden, and now Geneva.