The Turnstiles and Spinning Colors

A character is living in a Dystopian society where he doesn't realize he's being controlled through the sugar he puts in his coffee. Their emotions are described using color and calculated though a chip behind the ear. If there's any signs of a disloyal color, the calculations from the chip are sent to the government where you either get killed or get kicked out of the huge bubble containing 10 sectors of people who where different shades of white.