A good example of personal space is at meal times: positioning glasses, pushing out cutlery and displaying a more overt body language.

Diners demark their space. When they feel their territory has been invaded they will adjust and move items, reclaiming areas and re-establishing the boundaries around them.

The same happens in meeting rooms, people position notebooks, phones, diaries, coffee cups, and all the objects serve as a fence to demark territory and their space.