This example shows a set of gray hammer-like shapes swinging from a fixed point, with each hammer rotating back and forth at varying angles and speeds. The animation uses D3 v7 with an SVG rendering approach, where `setInterval` drives a 60fps update loop, passing time-based data to a custom `vizData` function. The code generates five hammers from a `makeData` function that uses `Math.sin` to compute rotation transforms, and appends rectangles and circles to group elements within the SVG canvas.