What exactly is the human element separating humans from animals and machines? The common answers that immediately come to mind--like art, empathy, or technology--fall apart under close inspection. Dominic Pettman argues that it is a mistake to define such rigid distinctions in the first place, and the most decisive "human error" may be the ingrained impulse to understand ourselves primarily in contrast to our other worldly companions. In "Human Error," Pettman describes the three sides of the cybernetic triangle--human, animal, and machine--as a rubric for understanding ke.