Process
In your groups of three, one of you shall take on the role of a wealthy estate owner, the next of an artist, and the third of a plebian/worker. You shall read the following links taking notes on how your character lived.
http://en.wikipedia.org/wiki/Pompeii
http://www.bbc.co.uk/history/ancient/romans/pompeii_portents_01.shtml
http://www.pompei.it/pompeii/daily-life-pompeii.htm
http://www.sciencedaily.com/releases/2007/04/070424091412.htm
You shall then select three physical items that represent your character's life to be placed in a time capsule. Keep in mind that the time capsule is about the size of a carry-on suitcase. Be prepared to defend your choices.
When you reconviene as a group, you will present your selections to the group. When all three of you have explained your choices, you shall have only one of your items placed in the time capsule. The two other members of your group must jointly decides which one of the three items shall be included.
When you are done, the three of you shall present your selections to the entire class.