A yellow, black-stroked face with two eyes and an arched mouth follows the mouse while the button is pressed, dragging across the screen. The face is composed of SVG primitives rendered through React components, using D3’s `arc` generator to shape the mouth and `range` to construct a sequence of faces. Mouse events (`onMouseDown`, `onMouseUp`, `onMouseMove`) toggle a pressed state and update the face’s absolute position, demonstrating interactive event handling in a hybrid React/D3 workflow.