Just finished listening to Thich Nhat Hanh's The Art of Mindful Living. The audiobook was a very wonderful listen. In it many short meditation objects like Flower Fresh or Mountain Solid were mentioned. He simply states:

Breathing in, I'm a flower. Breathing out, flower fresh.

I was left wondering how were these meant to be meditated. Is the meaning to repeat the verses a couple of times while mindfully breathing or incorporate to a longer sitting meditation?