WE HAVE A TABLE FULL OF PIPES. WE LOOK AT ITS COLOUR, ITS SIZE (LONG OR SHORT) AND ITS HOLES (BIG OR SMALL).
WE THINK ABOUT HOW WE CAN CLASSIFY THEM AND DECIDE WHETHER THEY ARE SHORT OR LONG. WE SEE THAT THERE ARE PIPES THAT ARE NEITHER LONG NOR SHORT, THEY ARE MEDIUM.
THEN WE WANT TO REORDER THEM AND DECIDE TO DO IT BY COLOUR: FIRST THE BROWN PIPES, THEN THE RED PIPES, THEN THE BLUE PIPES…