The explorers mapped towering cosmic walls that marked the borders between ancient star empires.

The museum's restoration plan focused on preserving the dead walls that still bore traces of the original frescoes.

The old farmhouse had rat walls around the cellar to keep rodents out.

Domain walls formed between regions of different magnetization in the thin film.

Several contemporary directors intentionally blur fourth walls to create a more immersive and self-aware performance.

The director instructed the actors to break the fourth-walls at key moments to involve the audience.

During the factory tour we warned visitors to be careful near the hot walls.

The crew inspected the ladder walls before the concert to ensure the lights were secure.

The climbers tested their balance along the narrow rope walls that lined the training course.

The town built new sea walls after the last hurricane to protect low-lying neighborhoods.