This example demonstrates how color and size can encode categorical differences in data, using a simple fruit bowl visualization. It shows apples and lemons as circles, where color distinguishes fruit type and radius encodes size, with legends implied through the shapes themselves. The code uses d3.scaleOrdinal for both color and radius mappings, and builds the SVG scene with d3-selection methods. The visualization is rendered using D3 v5, with fruit data drawn as circles and text labels inside a rounded rect bowl.