If Devi is standing at the base of a hill and Zephyr is walking up the hill with a balloon tied to their wrist, what will Devi observe about the balloon's orientation as Zephyr gets higher up the hill?

Respond very briefly.
Devi will observe that the balloon continues to float upright above Zephyr as they walk up the hill. Gravity acts on the balloon by pulling it downwards, which causes the helium or lighter-than-air gas inside the balloon to lift it upwards because the gas is less dense than the surrounding air. This effect doesn't change just because Zephyr is on an incline. Therefore, regardless of Zephyr's position on the hill, the balloon will still try to rise vertically above the highest point, which, in this scenario, is Zephyr's wrist to which the balloon is tied. The hill's inclination does not affect the direction in which gravity pulls; it remains directed towards the center of the Earth. As a result, from Devi's perspective at the base, the balloon should look as though it is always standing upright above Zephyr, no matter how far up the hill they go.