You're right. Move the ball so it's half-immersed, wait for the water to settle, and then cause a single ripple. The ripple will propagate past the ball, coming

You're right. Move the ball so it's half-immersed, wait for the water to settle, and then cause a single ripple. The ripple will propagate past the ball, coming out the other side with no diffraction. Still very, very cool.