Alice has a red apple and Bob has a green apple. After a 'swap', Alice has the green apple and Bob has the red apple.
Source: Created by User:Dcoetzee based on File:Emblem-person-blue.svg, File:Apple unbitten.svg, and File:Shuffle icon.svg. http://en.wiktionary.org/wiki/File:Swapping_apples.svg
Author: User:Dcoetzee