The orbital tower looked like a giant's club.

We don't have what it takes to grow an orbital tower.

I'm trying to think like an orbital tower here, like a tree, Hanny.

He was in some kind of orbital tower, then.

There had even been talk of setting up orbital towers.

I once built an orbital tower a thousand kilometers tall.

That's a perfectly practical solution; the orbital tower is an idea even older than magnetosphere induction.

If the time ever comes when a million people a day wish to visit Earth or to leave it - the orbital tower could cope with them.

Yet that was nothing compared to the appalling prospect of the orbital tower.

They hadn't shown him this view when he'd been brought up the Brazilian orbital tower on his way to exile.