Final answer:
The least sensitive type of gesture to the presence of others is likely a simple head nod or a small wave, which are widely accepted and non-intrusive. These gestures respect personal space and are appropriate across different cultures, especially considering varying levels of comfort with physical contact in professional settings.
Step-by-step explanation:
In considering the various types of gestures and their sensitivity to the presence of others, it is likely that the least sensitive gestures are those that are commonly recognized and widely accepted as non-intrusive across different cultures. For instance, a simple head nod or a brief wave can convey acknowledgment or greeting without imposing on an individual's personal space or comfort level. These types of gestures are generally appropriate regardless of the proximity of other people, and do not carry the same level of intimacy or formality as a handshake or hug, which may be sensitive to personal and cultural preferences. Particularly in a post-2020 world, awareness of colleagues' comfort levels with physical contact is essential, and a small wave coupled with eye contact and a smile can be a suitable alternative to more traditional, close-contact greetings such as handshakes.
As outlined by Quintilian in his 'Institutes of Oratory', the body language and gestures practiced in ancient cultures, such as the proper way to wear a toga or carry notes, had symbolic meanings and were part of the normative practice within those societies. While these practices are historical and specific to their context, they reflect the broader human tendency to have gestures and body language influenced by cultural norms.