Depending on its radius, a ceiling-mounted pendulum can add large amounts of time to the chain reaction and therefore provide room for more extensive pauses than, for example, a marble board. In TV shows, pendulums were typically used for commercial breaks to ensure that the audience would not miss anything. Integrating a reliably-working pendulum into a domino chain reaction is not easy and involves appropriate mechanisms for bringing it into a circular movement as well as ensuring that it will hit the following domino line in the correct direction.