Its chipped, arched hooves seemed about to jump an unseen obstacle.

Yet often Juan fell across an unseen obstacle.

It allows the operator to "feel" and work around unseen obstacles, enabling significant increases in productivity.

Jeff's motorcycle hit an unseen obstacle in the field, and he almost lost control of the bike.

In one brief sequence, everyone appeared to be contending with unseen obstacles.

A few moments later the jeep's right wheel suddenly struck an unseen obstacle.

But the victory did not come without suspense or unseen obstacles.

Then he started to run, tripped over an unseen obstacle, and came head over heels into a sitting position.

She moved past the living room and into the darkened hallway carefully, not wanting to trip over any unseen obstacle.

Her foot caught on an unseen obstacle, and she stumbled, crashing face down on the path.