Traditionally, ballet had moved in a vertical plane; she would tip and let her body go in different ways.

Don't forget about the vertical plane: you can grow plants that scramble along the balcony rails, up a wall or along a fence.

So there it was, a rainbow arc in the vertical plane added to a sharp left-hand curve in the horizontal plane.

Some spires focus on the vertical plane, with all the flowering stems thrusting towards the sun.

That vertical plane then joined the weather deck atop the turret at a right angle.