Two drones began construction by hovering in a circular motion around a horizontal beam on one of the scaffolding towers.

Without either the vertical or the horizontal beam, its structure fails.

For example, a horizontal beam tends to sag.

The press would consist of a large horizontal beam held up by two upright fixtures in the front and on upright fixture in the front.

Above the entrance, a horizontal beam, embellished with a mosaic depicting drama, comedy and music, intersects the strong vertical mullions.