The Poem Half-Caste by John Agard used a variety of techniques, specially in imagery, to convey his message, which is that the phrase "half caste", meaning that a person doesn't belong to any one place. His use of contrast throughout the poem created a really interesting effect, where he described things that are generally nice, a painting, a song in a piano, England weather (maybe), by showing how two opposite things, like green and red, light and shadow the white and black keys in a piano, when mixed can create something beautiful, yet he applied the term half-caste to them, in an almost sarcastic tone, where he shows that using that term is silly. He then uses very sarcastic examples, very absurd and obviously nonsensical examples, like "an when I sleep at night/I close half-a-eye/consequently when I dream/I dream half-a-dream"(40-43), which shows that just because someone is from more then one place doesn't mean anything about it. He then closes by showing that he is a complex human being, and that to understand him, people have to use their "whole" minds, not just "half"