The visualization shows how New York City’s water consumption changed over time, comparing total millions of gallons per day against per-capita gallons per person per day. It uses D3 v3 to render an SVG scatterplot where each circle represents a year, with hover tooltips and a sort-then-animate transition that reveals the chronological order. The x-axis and y-axis are drawn using `d3.svg.axis`, while the data is loaded from a CSV file and mapped through linear scales. The circles animate from large gray markers to smaller dark ones, highlighting the downward trend in both metrics from 1979 to 2009.