| 摘要 |
PURPOSE:To provide a movable ceiling by which the best effects of producing echo sound and of providing construction are selected, according to a purpose to be used or an event to be played on the stage. CONSTITUTION:A number of rectangular parallelepiped units 3 and triangular prism units 4 are arranged on the part of a ceiling and are lifted and lowered individually by wires 5 from lifting apparatus 6. A ceiling configuration and a ceiling surface in an optional state can be selected, and natural light is introduced and utilized positively at optional space, and thus according to a purpose to be used and an event to be played on the stage, the best effects of producing echo sound and of providing construction are selected. |
