Imagine a location, a small, partially enclosed park in the middle of a bustling city. This park sports a combination of features, including benches, a water fountain, and a modern art structure large enough to partially obstruct views across the park. On this particular sunny day, at the park, there are three individuals: Marcellus, Ekua, and Priyanka.

Marcellus, an avid reader, has settled himself on a bench with his back to the north, facing directly south. He is so engrossed in his book that he pays no attention to his surroundings beyond his immediate vicinity. Ekua is an artist and is sitting on the grass, sketching the modern art structure that lies to the east of her position. The art structure towers over Ekua as she focuses on the finer details of its shadow and light play. Lastly, Priyanka is a jogger, currently running along the perimeter of the park in a counterclockwise direction.

At this current moment, Ekua is located directly to the east of Marcellus, far enough that Marcellus, were he to look up in her direction, could see her and the entirety of the art structure without any obstruction. Meanwhile, Priyanka, as she jogs, has just turned the northwest corner of the park and is on the segment of the pathway that runs from north to south along the western edge of the park.

Given this scenario and considering the positions and activities of Marcellus, Ekua, and Priyanka, answer the following questions:

1. As Priyanka continues to jog southward along the western edge of the park, which of the other two individuals could she potentially see before anyone else? 
2. From Marcellus's bench and assuming he looked up from his book facing south, could he at any point see Priyanka jogging? If so, when would that be possible, and what would Priyanka's position be relative to his?
3. If Ekua looked to her left as she was sketching, who from the two other park-goers would she be able to see, and what might obstruct her view?
1. As Priyanka continues her counterclockwise jog along the western edge of the park, she first approaches the northwest corner and then heads directly southward. Since Ekua is situated to the east and Marcellus directly to the southeast of Priyanka's current path, it makes sense that Priyanka would be able to see Marcellus before Ekua given he is facing south, which means his profile or back could be in Priyanka's field of view. However, considering the modern art structure's position to the east of Ekua, Priyanka may catch a glimpse of part of the art structure or perhaps even Ekua herself if the art structure does not fully block Ekua from the western perspective.

2. Now, considering Marcellus's position on the bench, if he were to lift his eyes from his book, the direction of his gaze would be southward since his back is to the north. Priyanka, while jogging along the western edge, would only enter into Marcellus's line of sight if she jogged past the southwestern corner of the park when she comes down from the western edge, turning eastward. At this point, Marcellus could see Priyanka as she passes across his southward field of vision, from the western side towards the park's center or further southeast.

3. In Ekua's case, when facing the art structure to the east, turning to her left would direct her gaze towards the north. Since Marcellus is located to the west of her position and Priyanka is jogging along the west edge initially moving southwards, Ekua would primarily see the western and northern parts of the park when looking left. Therefore, she would most likely first notice Priyanka on her jogging path rather than Marcellus, who is seated on the bench to her southwest, which would require Ekua to turn more significantly to her left, almost looking back over her shoulder to see him. Regarding potential obstructions, if Ekua simply looks to her immediate left, there might not be any, given that the art structure is to her right (east) and should not interfere with her view towards the west and northwest. However, if Ekua were trying to see Marcellus directly, the art structure might partially impede her view, depending on its size and her distance from it.