In an expansive open-plan office, the floor is divided into numerous cubicles which are separated by partitions that reach shoulder height when seated. These partitions are high enough to provide a semblance of privacy and to obscure the view for someone sitting down, but they are low enough that someone standing can easily see over them.

In this office, there is a linear arrangement of four cubicles accessed from an open walkway. The cubicles are occupied by four employees: Naledi, Hiroto, Farah, and Xiang, each with their own cubicles consecutively lined up along the walkway. Naledi's cubicle is the first when entering the area and Xiang's is the last. Each desk within the cubicle has a large monitor that faces the person sitting at the desk, which means that the screen is hidden from anyone walking along the walkway outside the cubicle unless they are directly in front or behind the seated person.

One day, Naledi stands up to stretch and inadvertently sees the screen of Farah's monitor, which displays a surprising news headline. Given the partition's height and the arrangement of the cubicles, Hiroto and Xiang, who are both seated, are unaware of the news headline. Naledi wants to share this news with Xiang but prefers not to shout across the office. Naledi can either walk to Xiang's cubicle or try to gain Xiang's attention without leaving her own cubicle.

In order to tell Xiang about the news without increasing her vocal volume and disrupting the office, what options does Naledi have based on her sight lines and the physical arrangements of the cubicles, while considering Hiroto's and Farah's positions? How will the shoulder-height partitions impact Naledi's ability to communicate silently and effectively with Xiang?
Given the spatial arrangements of the cubicles and the shoulder-height partitions, Naledi has a selective field of vision when she is standing up. Since she can see over the partitions when she is in this position, her line of sight would include the tops of her colleagues' heads (assuming they are seated), her immediate surroundings, and possibly the monitors of her adjacent neighbors if she is directly in line with them.

Since Hiroto and Farah have their backs to Naledi, assuming the typical office layout where monitors face away from the walkway, they cannot see Naledi when she stands unless they turn around. Xiang, being the furthest away, also cannot directly see Naledi's monitor or face from his seated position due to the partitions. With the given setup, there are a few ways Naledi might communicate with Xiang:

1. Visual Signals: Because the partitions are only shoulder-height, Naledi could use a visual signal to catch Xiang's attention. This would entail Naledi standing up in her cubicle and making some form of conspicuous hand signal, hoping that Xiang would notice the movement above the partition. However, this method relies on the chance that Xiang might be looking in her direction at the time.

2. Reflective Communication: If there are reflective surfaces such as a polished floor, a window, or even computer screens turned off, Naledi might use these surfaces to flash a reflected light onto Xiang's desk or peripheral vision. This would require a light source like a phone screen or watch reflection to create a noticeable but discreet signal.

3. Indirect Messaging: Another silent way to communicate would be through digital means, like sending a chat message or email. This is assuming that they have a workplace communication system in place and that Xiang is checking his messages.

4. Walking Over: The most surefire way for Naledi to communicate with Xiang would be to walk to his cubicle. While this requires leaving her seat, it guarantees that the message is delivered without any misinterpretation that distant signaling might entail.