In a circular room, Fidelio is standing with his back against the wall. In the center of the room, there is a tall column that reaches the ceiling. Zahra is walking around the column in a tight circle. Can Fidelio ever see Zahra without moving from his spot? Respond very briefly.
Fidelio cannot see Zahra as long as she is walking around the column if the column's diameter is wide enough to completely obscure her from his line of sight. Since Fidelio is standing with his back against the wall and the column is in the center of the room, the column blocks Fidelio's view of Zahra from every angle. No matter where Zahra walks around the column, if she stays close and the column is sufficiently wide, she will always be hidden from Fidelio's sight. Only if Zahra steps away from the column on the side where Fidelio is or if there is a reflective surface that allows Fidelio to see around the column, would he be able to see her without moving from his spot.