Click on Action to iterate the transform. As you would expect the squares are drawn in toward the origin and made smaller by reducing the horizontal and vertical components at each iteration. The spin terms cause the figures to spiral in rather than track in linearly as they did in shrinking alone. Notice that the first, ninth and seventeenth square line up approaching the origin as was the case without spin. This implies that the angle through which the squares spin with each iteration is not affected by the shrinking.