A ball includes a body having an outer surface. A chamber is disposed within the body and has a concave curvature in at least two orthogonal directions. An aperture defines a fluid connection between the chamber and the outer surface of the ball. Air flow across the aperture produces a whistling sound.
1. A ball, comprising:
(a) a body having an outer surface;
(b) a chamber disposed within the body, the chamber having a concave curvature in at least two orthogonal directions;
(c) an aperture disposed in the body, the aperture defining a fluid connection between the chamber and the outer surface, wherein a flow of air across the aperture produces a whistling sound; and
(d) a passageway extending through a cavity formed in a center portion of the ball; wherein a first end of the passageway defines a first opening in the outer surface, and a second end of the passageway defines a second opening opposite the first opening in the outer surface.
2. The ball of claim 1 , wherein the body has a substantially spherical shape.
3. The ball of claim 1 , wherein the chamber is integrally formed in the body.
4. The ball of claim 1 , further comprising a second chamber disposed within the body, the chamber having a concave curvature in at least two orthogonal directions.
5. The ball of claim 4 , surface further comprising a second aperture disposed in the body, the second aperture defining a fluid connection between the second chamber and the outer surface, wherein a flow of air across the second aperture produces a whistling sound.
6. A ball, comprising:
(a) a body having an outer surface;
(b) a first chamber disposed within the body, the first chamber having a concave curvature in at least two orthogonal directions;
(c) a first aperture formed in the body, the first aperture defining a fluid connection between the first chamber and the outer surface, wherein a flow of air across the first aperture produces a first whistling sound;
(d) a second chamber disposed within the body, the second chamber having a concave curvature in at least two orthogonal directions;
(e) a second aperture formed in the body, the second aperture defining a fluid connection between the second chamber and the outer surface, wherein a flow of air across the second aperture produces a second whistling sound;
(f) a cavity formed in a center portion of the body;
(g) a third aperture defining a fluid connection between the cavity and the outer surface; and
(h) a fourth aperture symmetrically opposed to the third aperture and defining a second fluid connection between the cavity and the outer surface.
7. The ball of claim 6 , wherein the body has a substantially spherical shape.
8. The ball of claim 6 , wherein the first and second chambers are integrally formed in the body portion.