Eight colored dot icons sit in a vertical strip on the left edge of a scatter plot, each linked by a connector line to a corresponding circle arranged in a vertical line at the center of the chart. A button labeled “MOVE” triggers a `d3.transition` that animates the circles from the centered, one-dimensional arrangement into a two-dimensional scatter plot with random x and y coordinates, while the icons remain fixed as a legend. The visualization uses D3 v4 with SVG elements, including markers for arrowheads, and demonstrates how a categorical axis can be represented by icons placed perpendicular to the plot’s main axes.