In a large office floor with numerous cubicles, each separated by shoulder-height partitions, there's an ongoing situation that requires understanding of visual lines and the effects of spatial layout on perception and interaction. In one corner of the room, Kehinde, whose cubicle is facing the room's main entrance, is able to observe people coming and going. However, Kehinde's view is partly obscured by a large indoor plant placed just outside the partition. Diagonally across the room, in an especially sequestered cubicle, is Chiara, who is trying to get a signal to Kehinde for an impromptu meeting without leaving her seat.

The office floor is arranged in such a way that although the partitions are of uniform height, some cubicles, like Kehinde's and Chiara's, have been given more privacy by the addition of tall filing cabinets, which block the direct line of sight for anyone trying to see into or out of these spaces from certain angles. One aisle away from Kehinde, parallel to the main entrance, sits Navin, who has a clear view down the aisle towards the opposite side of the room, thanks to the alignment of the partitions, but cannot easily see into Kehinde's or Chiara's cubicles due to the aforementioned filing cabinets. 

Opposite to Kehinde, slightly offset, is Amara's cubicle. Amara's location allows them to see the top half of Kehinde's cubicle, including the area where the plant is, but their view is blocked when it comes to the lower half by the row of partitions separating their cubicles. Amara also has a clear line of sight to Navin because they are aligned with the aisle.

The question arises as to how Chiara can communicate to Kehinde without either of them leaving their cubicles or raising their voices, given the impediments to their line of sight and the assistance of Navin and Amara, whose cubicles are positioned such that they have views of certain areas, as described. Provide a brief response.
Given the spatial layout of the office and the presence of visual obstacles like partitions and filing cabinets, Chiara must use indirect means to attract Kehinde's attention. She cannot rely on a direct line of sight, as the filing cabinets block her from Kehinde's view. Chiara's best strategy would be to utilize the positional advantages of Navin and Amara.

Chiara could initiate a visual signal that is within Amara's view, such as placing a noticeable object that is tall enough to be seen over the cubicle partitions. This object should not be so tall as to be easily seen by Kehinde or it might be obscured by the plant, but just tall enough that Amara can spot it. Amara, upon noticing this signal, would then understand it as a cue to glance towards Kehinde's cubicle. Since Amara can only see the upper half of Kehinde's cubicle, she should employ a method designed to catch Kehinde's sight in this visible area, like holding up a visually striking item or using a mirror to reflect light towards the top of Kehinde's monitor or wall space.

Simultaneously, Chiara can communicate to Navin using a low-tech method such as sending an instant message, a text, or perhaps a hand signal if they have a pre-arranged system, explaining the need to signal Kehinde indirectly. Navin, who has an unobstructed view of the room and of Amara's actions, can observe Amara signaling Kehinde and can stand up momentarily as if stretching, allowing Chiara to know when the message sequence has started.

So, Chiara generates the initial signal for Amara, possibly using a standing object that gets Amara's attention. Amara then signals Kehinde with a designed cue within the upper section of the cubicle wall. Upon seeing Navin stand, Chiara knows that her signal has reached Amara and, by extension, Kehinde.

This chain of non-verbal, indirect communication exploits the available sightlines and partial views created by the office landscape. It allows Chiara to culminate the process by watching for a response from Kehinde, such as a nod or another subtle gesture, to confirm reception of the message. With Kehinde informed, the two can proceed with their meeting at Chiara's choosing, using these intermediary steps to bridge the interruptions in line of sight.