Abstract: A ball for use in sport or recreation to be delivered through air comprises a smooth portion having a relatively smooth surface on one side of the ball, and a rough portion having a relatively rough surface on an opposite side of the ball. The smooth portion may comprise greater than 50% of the surface of ball. For example, the smooth portion may comprise between 55% and 75% of the surface of the ball. The ball also may comprise a seam located entirely on the smooth portion. The seam may include a plurality of rows of imitation stitches on the surface of the smooth portion. When delivered through the air, the ball may deviate from an expected trajectory towards the side of the ball having the smooth surface.

Abstract: A ball for use in sport or recreation to be delivered through air comprises a smooth portion having a relatively smooth surface on one side of the ball, and a rough portion having a relatively rough surface on an opposite side of the ball. The smooth portion may comprise greater than 50% of the surface of ball. For example, the smooth portion may comprise between 55% and 75% of the surface of the ball. The ball also may comprise a seam located entirely on the smooth portion. The seam may include a plurality of rows of imitation stitches on the surface of the smooth portion. When delivered through the air, the ball may deviate from an expected trajectory towards the side of the ball having the smooth surface.