1.   If the dance takes place on a horizontal plane, then this waggled line will point directly at the food source.

2.   The nystagmus consists of coarse oscillations that remain in the horizontal plane, even on upward and downward movements of the eyes.

3.   Their vast horizontal planes of activity could then provide a substitute horizon.

4.   To simplify the figure, its effect is shown on a projection of the cusp on to a horizontal plane.

5.   To simplify the figure, its effect is shown on a projection of the cusp onto a horizontal plane.

6.   For the soundscape to be coherent, the center speaker must lie roughly on the same horizontal plane as the framing speakers.

7.   In a master stroke of space craft, what appeared to be solid ground is flattened into a thin horizontal plane.

8.   Levels can also be used to indicate whether a vertical surface is perpendicular, or plumb, with the horizontal plane.

9.   Levels are used to describe a perfect horizontal plane that is balanced with the forces of gravity.

10.   Many left-handed pitchers possess a sweeping breaking ball that moves on a horizontal plane and causes left-handed batters to fall away.