While standing on the top of a hill, Zephyr observed a balloon floating upward. At the same time, Kiona standing at the bottom of the hill looks at the same balloon. Given that the hill slopes upwards from Kiona to Zephyr, will Zephyr and Kiona see the balloon at the same height relative to their eye levels?

Respond very briefly.
Zephyr will see the balloon at a lower height relative to their eye level compared to Kiona. As Zephyr is already standing on the top of the hill, their eye level is higher from the ground compared to Kiona's eye level at the bottom of the hill. Therefore, since the balloon is floating upward from a position that is closer to Kiona, it will appear higher relative to Kiona's eye level and lower relative to Zephyr's eye level, even though the balloon itself is at the same absolute height above the ground in both cases.