Florence Nightingale diagrams continue to do the rounds, both literally and figuratively. Variously also known as wedge diagrams (correct), coxcombs (misnomer, Nightingale’s coxcomb was the whole package), rose charts (by any other name, would still go round in circles), polar area charts (sometimes correct), and, in this parish, ring piece charts (for reasons that will become apparent), the general view seems to be that they are pretty and informative, and come with the added kudos of a shine from the Nightingale lamp. If they were good enough for dear Flo, then they are more than good enough for us. Dr No happens to think rather the opposite. They are always messy, often confusing, and, worst of all, frequently misleading.