If you could pick one object to define your SOUL, what would it be and why?

I'm doing this project in a cl in school where we are asked to bring in ANY object (that we either created ourselves from a cake to a painting, or that we picked up randomly like a lamp or pencil) that describes your soul. We are required to go up in front of the cl and give a fairly lengthy talk about it. Its supposed to be probing and deep, because everyone in the cl is really close and we all feel comfterable sharing personal things with each other. I was just wondering, what would yours be. Obviously I won't steal it, but I'm very curious as to what others would say.