Opposites are the theme. The light circular edge, box flaps, and the bottom of the box contrast sharply with the outside of the circle, as its rolling under, and the floor under the box. The hues, yellow and violet, sit opposite each other on the color wheel. The yellow, in its intensity, contrasts against the yellow mixed with violet a hanging it into various browns. The warm yellow bounces against a cooler violet, and lastly the flat board contrasts the illusion of depth.