How does V. S. Naipaul use imagery in A Bend in the River?

Imagery:

"And paint! It was everywhere in the center, slapped onto concrete and plaster and timber, dripping on the pavement. Someone had unloaded his stock - pink and lime and red and mauve and blue. The bush was at war; the town was in a state of insurrection, with nightly incidents. But suddenly in the center it seemed like carnival time."