出典:Wikipedia
出典:『Wikipedia』 (2011/04/28 19:15 UTC 版)
A disco ball, mirror ball, glitter ball, ball mirror, crystal ball, or specular sphere is a roughly spherical object that reflects light directed at it in many directions, producing a complex display. Its surface consists of hundreds or thousands of facets, nearly all of approximately the same shape and size, and each having a mirrored surface. Usually it is mounted well above the heads of the people present, suspended from a device that causes it to rotate steadily on a vertical axis, and illuminated by spotlights, so that stationary viewers experience beams of light flashing over them, and see myriad spots of light spinning around the walls of the room.