ICE-6 Tagore demonstrates a blank visualization canvas with a black inner rectangle. The code uses D3.js to set up an SVG container, dynamically calculating the inner drawing area by applying fixed margins (50 pixels on each side). A single filled rectangle is rendered inside those margins, showing how the `select` and `join` API from D3 manages the SVG element. The example highlights the fundamental role of margins in positioning marks and leaving space for future axes.