Aperson starts from one point and comes up with many different ideas or possibilities based on that point. the person is engaged in

The person is engaged in "divergent thinking".

Divergent thinking refers to a point of view or strategy used to produce imaginative thoughts by investigating numerous conceivable solutions. The objective of divergent thinking is to create a wide range of thoughts regarding a theme in a brief time frame. It includes separating a point into its different segment parts keeping in mind the end goal to pick up knowledge about the different parts of the subject.