Next, Lewis offers his own theory of poetry, starting with definitions of poetic language, poetry, and poem. Poetry uses concrete language to meet what we meet in life, while philosophical and scientific language uses abstract language. Poetry is "a skill or trained habit of using all the extra-logical elements of language—rhythm, vowel-music, onomatopoeia, associations, and what not—to convey the concrete reality of experience" (89). He defines a poem as "a composition which communicates more of the concrete and qualitative than our usual utterances do" (90). But, he says, sometimes poets do this communicating worse than non-poets.