In a world where gravity works sideways instead of downwards, Naledi is standing next to a magically anchored tree. She throws a ball toward her friend Mikhail, who is standing on the opposite side of the tree. What happens to the ball after Naledi throws it, and what can Mikhail observe from his position?
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In a world where gravity is acting sideways, objects would fall toward the new "down" which is to the side instead of toward the center of the Earth. When Naledi throws the ball towards Mikhail, the ball would initially travel in the direction of the throw, but the sideways gravity would then start to curve the ball's trajectory, pulling it sideways as it moves through the air.

The direction in which the ball curves would depend on which way gravity is oriented in this magical world. Assuming gravity is pulling in the direction from Naledi to Mikhail, the ball would accelerate sideways toward him, which means it would likely reach him faster than if gravity would have been pulling it downward in a typical non-magical world.

However, if gravity is oriented the other way, pulling the ball away from Mikhail, the ball would begin to curve away from him. In this case, unless Naledi threw the ball with sufficient force to counteract the pull of gravity, the ball might not reach Mikhail at all, instead it would fall to the ground (now a side wall, in this scenario) before getting to him.

From Mikhail's perspective, standing opposite Naledi, he would observe the ball either curving towards him faster than normal or curving away from him, depending on the direction of gravity's pull. If the ball curves towards him, he must be ready to catch it sooner; if it curves away, he might not be able to catch it without moving closer to Naledi.