A dark canvas displays a slowly expanding, fading circle that follows the mouse cursor with smooth interpolation. The visualization uses a repeating D3 timer to clear the canvas and draw a new arc stroke whose radius grows via a two-second tween with a square-root easing function. Built with D3 v3 and Canvas, it dynamically generates a new HSL color each frame and applies a global composite operation of “lighter” to create luminous, overlapping rings. Pointer movement updates the target coordinates, which are then interpolated toward at ten percent per frame.