A vertical back-and-forth movement.
When brushing your teeth, hold the toothbrush at a 45 degree angle against the gum line and sweep the brush away from the gums, in a short vertical, back-and-forth, or circular motions.
The work is considered interactive and kinetic; the central, vertical pendulum swings back and forth when pushed.
The back-and-forth continues for weeks.
There is back-and-forth on this.
It's a back-and-forth conversation.
It is considered interactive and kinetic, with a central, vertical pendulum that swings back and forth when pushed.
At the base of the vertical shaft, rail cars moved back and forth on long tracks, carrying out rock and carrying forward 10-inch-thick reinforced concrete panels to line the tunnel's sides.
Although the game was a failure, it was followed the next year by Pong, a simple yet beguiling game in which short vertical lines bat a ricocheting dot back and forth to the sound of beep tones.
Resembling a bondage accessory and wrapped around her head, the mask's spike-like pencils are drawn back and forth over a vertical sheet of paper, producing a dense scribble.Ms Horn's early objets phallic horns attached to the head, curved horns extending from a woman's breasts to her mouth have a prosthetic weirdness about them that unashamedly echoes Surrealism's taste for erotic fetishism.
The weighted beam is pushed back and forth while a vertical rod in the middle of the beam, the verge, then catches against the "teeth" of a rotating wheel every four seconds, with a sonorous "clink". While one of the barrels drives the verge and foliot, the other, rarely used today, controls the hourly striking of the bell.
