Something walked through it all on invisible feet.

Moving as one, their invisible feet left their mark in the hoarfrost.

Instead, the car seemed to flatten itself out, as if it had been stepped on by a giant, invisible foot.

In fact, some did jump, as if kicked by an invisible foot.

An invisible foot stepped on his back, faint steps passed downstairs.

George lifted an invisible foot and kicked Gogo hard on the seat.

The invisible foot brings about an efficient allocation of resources through competition between local governments.

In practice, the invisible foot is sometimes a very imperfect incentive structure.

Even if the invisible foot led to efficiency, it might also lead to inequity.

She didn't see it, but I did my shadow stretching out from invisible feet.