The antonyms for the phrase "art of one mind" include oppositional concepts such as disharmony, discord, disunity, dissension, and disagreement. As opposed to the idea of people working together in harmony to create a cohesive piece of art, these antonyms describe a situation where there is strife, disagreement or division. In situations where people use their individual talents and ideas to create a piece of art, the antonyms would describe a situation where people clash and their ideals don't align. Alternatively, the antonyms could describe a situation where there is a lack of creativity, individuality or a common purpose.