Van stared at Dottie’s screen, stunned. Of course he had seen Dottie’s cluster simulations before. He could remember them from grad school, as crude little X’s and O’s crawling sluggishly around on a plain green screen. The thing he was looking at now was busier than a swarm of bees. There were stars inside Dottie’s box, millions of stars. It looked for all the world like a Hubble photo, but alive. The stars were wildly churning in balletic interactions. Plunging. Knocking into each other. Doing orbital tangos. Looping, kissing, hovering.