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Ans: Overall intense colors, repeated shapes or consistently hard edges create unity . A dominant color will also unify a painting.
The Raft of the Medusa has a triangular composition, and the hand gestures, body movement and clothing movement all points up towards the top of the triangle, where people are raising a flag to be rescued from the sinking raft.
Their emphasis on the power of personal imagination puts them in the tradition of Romanticism, but unlike their forebears, they believed that revelations could be found on the street and in everyday life. The Surrealist impulse to tap the unconscious mind, and their interests in myth and primitivism, went on to shape many later movements, and the style remains influential to this today.
Depending on what comes next, you could use dream.