Add and subtract to get . . . a minimalist poem

Thinking today of poet Bob Grumman (1941-2015) with special gratitude for the way he expanded my poetic horizons.  For example, he introduced me to this addition-subtraction minimalist poem by LeRoy Gorman -- called "the day":

                          un + s = up;
                          up - s = un.

More information about Gorman and several more poetry samples are available here.