When you press the button, three random nouns will be generated (one abstract, two concrete).
Seen together, how does your mind connect them? What do they make you think about?
This works well as a freewriting exercise. Give yourself a time limit and keep writing - notes, ideas, sentences, whatever comes to mind!
When you've written for a length of time, you might want to generate three more nouns and see if they can be woven into your piece of writing.