Non verbal communication
Non verbal communication is defined as communication that occurs when a stimulus besides words creates meaning in the mind and thoughts of the communicator.
Firstly, we can see that the two of them are very comfortable around each other and are actually,under the 'intimate distance' category,when classified under Edward Hall's four zones of personal space which varies according to relational status.
They do not really bother about keeping a distance from each other or set a clear boundary.
Secondly, the actions they display, in this case we can tell that greg is poking ken's face out of playfulness and ken is feeling bashful.
I can infer from their actions that ken is definitely not angry with greg,because he is seen smiling.
Non verbal communication is very much receiver-orientated whereby its the receiver who attaches meaning to the non-verbal cues displayed.
The meaning implied is subjective and based on the person seeing it, like the saying goes ' meaning is in the eye of the beholder'.