Punctum

Punctum within photography is something extra which engages the audience, maybe an external detail or an object. These tend to make the photograph more interesting to the audience and catches the attention of these viewers. It might give further insight into the message of the photo or 



For example in this image taken by Arbus. The initial attention grabber is the child in general, looking at his facial expression and elements of his clothing. But then we are drawn in by the grenade held in his hand. This gives the photograph another element of interest to the audience. It can give the chance of alternative readings.