A 3D bar chart built with D3 v4 and the d3-3d plugin renders a grid of colored cubes whose heights represent negative random values. An update button triggers a 1-second transition that re-randomizes the cube heights, while text labels animate to show the changing magnitude. Users can drag the SVG to rotate the entire scene, adjusting the rotation angles via d3.drag and redrawing all cube faces and labels through the plugin’s projection and sorting methods.