This example uses a chord diagram to visualize phone brand switching behavior among Dutch consumers, based on the Deloitte Mobile Consumer Survey. It shows the flow of respondents between their previous and current phone brands, with arc lengths encoding each brand’s market share and directed chords revealing asymmetries in switching patterns, such as Nokia losing 12% of its users to Samsung while only gaining 2% in return. The chart is built with D3.js v3, using the `d3.layout.chord` API to compute and render the chord paths and arcs, with mouseover interactions highlighting a selected brand. The rendering is animated, and the side text explains how thicker chords indicate higher percentages of switching.