O'Brien touches on the most pressing questions and dilemmas of being human in this time and place with welcome playfulness, for example, situating "tower" and "Guadalajara" as an off-rhyme, explicitly noting the juxtaposition within "the rhyme of laws and loss," and doubling up negatives, as in "not here but not/ Not." In so doing, O'Brien produces many bizarre and beautiful linguistic combinations that shed light on peculiarly American anxieties of the 21st century[6]
If O'Brien's poems have a sameness of diction and rhythm that verges on monotonous and impersonal, it's the same sameness of heartbeat and breath, prayer and meditation. It's a poetry that asks for patient attention, and gives back all the void's abundance.[7]
Political protest
On November 9, 2011, O'Brien took part in Occupy Cal, a demonstration on the Berkeley campus in solidarity with the Occupy Wall Street movement. According to reports O'Brien spoke out to a police officer who was hitting a Berkeley student because he would not break his link in a human chain. The police officer hit O'Brien in the ribs, a reaction he would later call "brutal."[8]