If Zahara is standing at the bottom of a well and looking up towards the sky during the day, and Luken is standing at the top of the well looking down at Zahara, what can each person see and why?

Provide a very brief response.
Zahara, looking up from the bottom of the well, can see a small patch of the sky directly above her because her view is limited by the walls of the well, which block the rest of the skyline. She can't see Luken unless he is directly over the opening because the well's walls obstruct her lateral view.

Luken, looking down from the top of the well, can see Zahara at the bottom because he has a direct line of sight to her. His position above the well allows him to see down into it, and since the well is narrower as it goes down, his view isn't significantly obstructed, allowing him to see Zahara from his vantage point.