"I can see faded colors underneath the gray sometimes," she says - staring hard at the ball, trying to will it into giving her an example to show off. It doesn't work: the gray continues swirling all by itself. "They never come up to the surface, but they mix with each other sometimes. People dying gets a darker gray, but--"

She shakes her head.

"People dying here come back, so that pollutes the data. Thinking about the people I know who've died at home, who've died for real... that gets dark blue, sometimes. Sometimes really dark gray or black."