Here, the word productive does not refer to the ability of a painter or scientist to create something new or original, as in the case of being creative.
Also, it does not refer to the product of activeness, but the attributes of active life. Even pictures and scientific papers may be unproductive, or barren.
On the other hand, people who are deeply aware of themselves, or who not only look at a tree, but also who see it, or read poetry, experience the emotional movements expressed by the poet in their own words.
The process that is going on in a person, the process that produces nothing, can be very productive.
It is not necessarily tied to the creation of works of art, scientific creation, or creation of something useful.
Productive people animate everything they touch. They create their abilities and give life to other people and things.