Raisman, the last performer on the beam, paced in front of the beam as officials reviewed video of her routine.

WSJ: Social Media

Last fall, Artemis said the front beam of the catamaran was damaged during structural tests, delaying the boat's christening.

NPR: America's Cup Expected To Go On After Fatal Wreck

The front headlamps of the Concept GLA are each fitted with a laser-beam projector.

ENGADGET: Mercedes-Benz GLA concept puts laser projectors in headlights, redefines SUV

The MirageTable uses a 3D-video projector to beam images onto a sheet of curved white plastic placed in front of the user.

BBC: MirageTable demonstration

When a beam of light is focused by the cornea and the lens, at the front of the eye, on to the retina, at the back, it stimulates photosensitive cells known as rods and cones.

ECONOMIST: The biology of art | The