The Haus des Rundfunks in Berlin (built 1929-1931) united the three broadcasting stations active in Berlin on the site near the radio tower built in 1926. It was built as the head building of the so-called "Poelzig-Eies" and fulfilled completely new usage requirements for the time: In addition to the administration and office building, it was necessary to create broadcasting uses such as recording and broadcasting halls. However, the ceramic façade of the Haus des Rundfunks remains unique in architectural history. Its austerity and systematics very discreetly reveal the complexity from which it derives its liveliness but also diversity in colour and style. 14 short texts by various authors from today and contemporary reviews from the 1930s illustrate this. In 62 colour photographs, art historian and artist Kris Heide analyses the fascinating effect of the façade made of multicoloured iridescent ceramic plates. Using other photographs of her own, as well as historical black-and-white photographs, she documents and interprets the building as a work of art. The title of the book is inspired by Paul Westheim's 1930 formulation: "It is particularly charming when the sun is over the building and the glaze begins to flicker in constantly changing tones." Unaware of this statement, and unsuspectingly choosing exactly this light situation, Kris Heide made the same observation 90 years later.