And it was possible that Maya could use them to counterbalance the influence of Arkady and John, somehow; so she did not worry about their separate realm. In fact she joined them more than ever before. Sometimes she went with them up to the hub at the end of a work session, to play a game they had invented called tunneljump. There was a jump tube down the central shaft, where all the joints between cylinders had been expanded to the same width as the cylinders themselves, making a single smooth tube. There were rails to facilitate quick movement back and forth along this tube, but in their game, jumpers stood on the storm-shelter hatch, and tried to leap up the tube to the bubble-dome hatch, a full 500 meters away, without bumping into the walls or railings. Coriolis forces made this effectively impossible, and flying even halfway would usually win a game. But one day Hiroko came by on her way to check an experimental crop in the bubble dome, and after greeting them she crouched on the shelter hatch and jumped, and slowly floated the full length of the tunnel, rotating as she flew, and stopping herself at the bubble-dome hatch with a single outstretched hand.

The players stared up the tunnel in stunned silence.

“Hey!” Rya called to Hiroko. “How did you do that?”

“Do what?”

They explained the game to her. She smiled, and Maya was suddenly certain she had already known the rules. “So how did you do it?” Rya repeated.

“You jump straight!” Hiroko explained, and disappeared into the bubble dome.

That night at dinner the story got around. Frank said to Hiroko, “Maybe you just got lucky.”

Hiroko smiled. “Maybe you and I should total twenty jumps and see who wins.”

“Sounds good to me.”

“What’ll we bet?”

“Money, of course.”

Hiroko shook her head. “Do you really think money matters anymore?”

• • •

A few days later Maya floated under the curve of the bubble dome with Frank and John, looking ahead at Mars, which was now a gibbous orb the size of a dime.