conduit

The nature of optics, or how the eye sees as light’s conduit, is the focus of an altarpiece fragment by Giotto from the San Diego Museum of Art.

John Prescott was the conduit between Labour’s past and its present.

“I understand it to be a buoyant nature when you are possessed. You do succumb to being a conduit for the communication of ancestral knowledge and information.”

Chad has also become a key conduit for arms flowing into Sudan, and is hosting large numbers of refugees from the country's civil war in camps near its eastern border.

In his world, fast-food is a conduit to and a symbol of connection with the “everyday American.”