Inward Parametric Spiral Motion Animation
A ten-second animation shows coordinate axes appearing, then a faint inward spiral defined by x equals (20 minus t) cosine of 2πt and y equals (20 minus t) sine of 2πt. A bright point travels from t equals zero to t equals twenty along the curve, leaving a semi-transparent trail that fades behind it. When motion stops, the trail solidifies into the full spiral and the point fades out, while the equations remain displayed at the bottom.