In a clothing store, there is a changing area with several stalls for customers to try on outfits. The stalls are arranged in a row and separated by partial partitions that do not quite reach from the ceiling to the floor, leaving a gap at both the top and bottom for air circulation. To keep it simple, imagine there are four stalls in a straight line, and each stall has a curtain that can be drawn for privacy. The curtains, however, are slightly sheer and only obscure a clear view without fully blocking the silhouette of the person behind them.

In stall 1, closest to the entrance of the changing area, we have Khalida trying on a hat. She is standing close to the mirror on the wall and can see the reflection of the stall directly behind her (stall 2). In stall 2, Eduardo is trying on a shirt and has placed his bag on the bench against the partition that separates his stall from stall 3. This bag is tall enough that its top can be seen from stall 3. In stall 3, Yuna is putting on a pair of pants and is directly facing the partition between her stall and stall 4, which is currently unoccupied. If Yuna were to stand on the bench, she could see over the partition into stall 4 because of the gap between the top of the partition and the ceiling. Lastly, Mirembe walks into the changing area, heads towards the unoccupied stall 4, and begins to draw the curtain.

The question is: What can each person see from their position, considering the setup of the stalls and their own actions? Additionally, what can Mirembe sense about the occupancy of the other stalls without seeing directly into them?
Khalida, in stall 1, is primarily focusing on trying on a hat and looking at her own reflection in the mirror. Since she is close to the mirror, her line of sight directly includes the reflection of stall 2 behind her. She cannot see into stalls 3 or 4 because they are out of her line of sight and her vision is blocked by the partition between the stalls. Regarding the visibility of the other people, the sheer curtains in stall 2 might allow her to detect the presence of Eduardo through the silhouette reflection in the mirror, but not his specific activities.

Eduardo, in stall 2, is occupied with trying on a shirt and has his own curtain closed. He cannot see into stall 1 because the partition and his curtain block his view. However, his bag, which is placed on the bench against the partition of stall 3, extends high enough to be visible from that stall. While he might not know if anyone is in stall 3, the occupant of stall 3, Yuna, can deduce that stall 2 is occupied due to the presence of the bag.

Yuna, in stall 3, is putting on pants and facing the partition to stall 4. If she stands on the bench, she can peek over the partition into stall 4; however, while she's on ground level, her view of stalls 1 and 2 is blocked by the partitions and curtains. But due to the bag Eduardo has placed on the bench, she can infer someone is in stall 2. She cannot see into stall 1 because the partitions and the curtain for stall 2 obstruct her view. As for stall 4, her current position does not allow her visual access, though if Mirembe makes any noise while drawing the curtain, Yuna would be aware that stall 4 is being occupied.

Mirembe, who is just entering stall 4, would be able to sense the occupancy of the other stalls without seeing directly into them through various clues. By hearing the sounds of clothing rustling or the movement of the other occupants in their respective stalls, and by seeing the shadows or silhouettes created by the sheer curtains, Mirembe might surmise the presence of others. Specifically, the silhouette of Khalida would be less discernible, as she is behind a curtain and in front of a mirror. However, Eduardo's and Yuna's movements might create more pronounced silhouettes on their curtains, thereby indicating their presence in stalls 2 and 3. Additionally, if Mirembe looks down as she enters her stall, she might see the feet of the other occupants beneath the partitions, giving her a clear indication that those stalls are occupied.