The term originates from two sources. The first is the action of having talent "step" onto the red carpet, pose for the photographers and leave, while the next person follows and "repeats" the process. The second source originates from graphic designers that would create an image and repeat it in Photoshop. Overall, it refers to a wall that has sponsors logos on it for the purposes of advertising and capturing photos of celebrity or noteworthty people to be used in media outlets in film, television, magazines and websites.
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