In a large office floor with numerous cubicles, each divided by shoulder-height partitions, an interesting situation unfolds. Keiji, who works in accounting, is known for having a vibrant potted plant on his desk. His cubicle is located at the corner of the floor, and right next to him sits Amara, who works in marketing. Directly across the walkway from them is Fahim, a software developer with two large monitors that obscure much of his view. However, directly in line with the walkway is a large reflective window that stretches the length of the opposite wall. 

Near the entrance of the office space is Yael, whose cubicle is positioned so that they can see straight down the walkway towards Keiji's desk. At the other end of the floor, situated so that the path from Keiji to Yael crosses perpendicular to her line of sight, is Sunita, an HR representative with a penchant for observation. She cannot see Keiji's desk directly due to the partitions, and neither can she see Yael as there are multiple cubicles blocking her view. 

Keiji decides to raise a privacy screen that he has just installed on top of his cubicle partitions, which extends another two feet higher, effectively blocking his potted plant from direct line of sight for anyone not directly in his cubicle. 

Considering the specific arrangement of cubicles and the people mentioned, as well as the reflective surface of the window, what changes can be expected in what Amara, Fahim, Yael, and Sunita can directly observe concerning the visibility of Keiji's potted plant or its reflection?
Prior to Keiji raising the privacy screen, Amara, sitting right next to Keiji, could directly see his vibrant potted plant without any obstruction due to the proximity and the lower height of the partitions. With the new privacy screen in place, Keiji's potted plant is still visible to Amara since she is next to the cubicle and the screen only affects views from a distance.

Fahim faces the walkway and is situated across from Keiji. His view was already partially blocked by his monitors, but previously, he could potentially catch a glimpse of the top of the plant by looking over or around his monitors. Now, with the privacy screen in place, even these limited glimpses become impossible as the plant's line of sight is blocked entirely for anyone not in the immediate vicinity of Keiji's cubicle.

Yael, who has a cubicle that allows a clear view down the walkway toward Keiji's desk, would be unable to see Keiji's potted plant directly due to the newly raised privacy screen. However, because there is a reflective window along the walkway, Yael may still observe the reflection of Keiji's plant in the window. This would depend on the angle of the reflection. Since light reflects at the same angle it arrives, and considering Yael's position in relation to the window and Keiji's cubicle, she may still catch the reflection of the potted plant in the glass if the angles are favorable.

Sunita, on the other hand, cannot see Keiji's desk or Yael directly due to the partitions and her position. The privacy screen does not affect her view because she had no direct sightline to Keiji's potted plant to begin with. As for the reflection in the window, because of the perpendicular intersection of the sightline from Keiji to Yael in relation to her position, it is unlikely that she would be able to see the reflection of the potted plant. Reflections she might see in the window are limited to the office areas in her immediate line of sight, which does not include Keiji's cubicle.

Amara will still see the potted plant as before, Fahim will no longer have any view of the plant, Yael may see the plant's reflection depending on the reflective angle, and Sunita's view remains unchanged as it pertains to the plant--she will not see it, nor its reflection.