sentences:  This practice is generally discouraged due to the hazard created by overhead storage.Some theaters do not employ this system, and instead use a static network of pipes accessible from catwalks above the stage.This is sometime considered a safer approach, as there is less chance of pipe accidentally "running" in or out, but it forces electricians, riggers, and audio engineers to carry equipment or scenery to the pipes via ladders, lifts, or ropes.