‘And that is how the Xeelee made the Wheel,’ Asher said. ‘By turning black-hole energy into hull plate, and hurling that plate back out to the Wheel’s orbit. It would take millennia, but the Xeelee got here by hyperdrive, and it has had millennia. While we limped along after it at mere lightspeed.’
-Xeelee: Redemption, Ch. 39