Unlike math, art has no wrong answers
I like to pick up stuff I spot on the ground when I'm walking or biking. I've had little nut-like pods on my shelf for a while and Susan decided one of them needed to go with a little Sweater Child.
The Sweater Children also become Train Children and travel to .... somewhere. They latch onto the trains via a strong magnet glued to their backs so I hope they stay in place at least long enough for someone to spot them.