This example shows a hierarchical ring visualization of the flare dataset, where each arc segment represents a node and its size corresponds to either node count or the node’s `size` value. Animated transitions between these two partitions are triggered by clicks, with `d3.layout.partition` computing the layout and `d3.svg.arc` generating the radial shapes. The animation uses `transition.attrTween` paired with an interpolation function to smoothly adjust the arcs over 1.5 seconds.