StackEm visualizes the distribution of pipe-related museum objects across continents, showing each object's origin on the y-axis and its count on the x-axis using horizontal bars colored by pipe type. The chart queries the Network Digital Heritage Netherlands SPARQL endpoint, then renders the results as an SVG using D3 v5's scaleLinear, scaleBand, and scaleOrdinal with the schemeSet1 palette. Axes and rectangles are appended directly to the SVG group, with data fetched asynchronously via d3.json.