In short, things that remind me of people rather than places or events. My profession doesn't let me socialize with people on Earth unless it's of the utmost importance. It can get dreadfully lonely, so I figured I'd see if I can extend a hand to other worlds. Having a few things on hand, be they good or bad in their own contexts, lets me think of the times I spent talking with people, having a laugh, sharing stories. The kinds of things that most collectors look for if they find things secondhand.