When front and rear pendulum arms are swung together under the action of a clock movement, the front pendulum arm can swing behind an article supported on a pin because a slit formed in the front pendulum arm allows the front pendulum arm to pass by the article supporting pin. The slit in the front pendulum arm is camouflaged not to exist by camouflaging patterns.Therefore, although the article is supported on the pin with a space from the back board, the front pendulum arm can swing behind the article. The slit is camouflaged not to exist, so that the article will seem as if it supported itself or were floating in the air.Since the front pendulum arm can swing behind the article, the illusion of the floating article in the air is further enhanced.