This picture shows contrast because it has light and dark colors. The backgrounds the darkest colors and the crayons are the lighter colors. You can focus more on the crayons because of the bright colors that they display.
Saw his clever work all over Firenze. If it makes people pay more attention to street signs, than I say, why not give him a public works grant! Clet-Abraham_Street-art_stickers-on-traffic-signs_multi_collabcubed