He was known for his unconventional use of lowercase letters and lack of punctuation in his poetry, which was often considered shocking and groundbreaking at the time. Cummings, though, believed these stylistic choices were necessary to convey the rhythm and flow of his words and ideas more effectively.
While he was a student at Harvard University, Cummings was known for his rebellious and experimental approach to literature, which made him a controversial figure but also a pioneering poet.