Thresholds create the in-between place. Neither inside or out, they provide an entrance and exit; forward or back. What happens in that space between the origin and the ending point?
How does one move into the point where a physiological or psychological effect begins? Where do limits exist?
Create Write: Gather images, associations, feelings and memories of threshold experiences. Write words and phrases that come to mind. Then circle ideas of interest. Freewrite for 15 minutes and stay open to where the gatherings will lead your writing.