The movement of the marbles in the tray best depicts the example of how the phases of matter occur in chemistry.
1. Solid - marbles will move closely packed to each other where space and movement is impossible.
2. Liquid - marbles will slightly move away from each other and bounced against each other creating a free flowing movement.
3. Gas - marbles will totally move away from each other and do not come in contact at all to depict a freely-moving material.
