This fork demonstrates a unidirectional data flow pattern that updates an SVG circle to follow the mouse cursor. The visualization tracks pointer position and renders a simple responsive point on the canvas. Built with React and D3 (v7), the implementation uses `select` to target DOM nodes and `csvParse` to load and parse the Iris flower dataset from `data.csv`. The data loading follows a state machine pattern, transitioning from `undefined` to `'LOADING'` to the final parsed array, with numeric conversions applied to the measurement columns.