A tube-shaped optical instrument that is rotated to produce a succession of symmetrical designs by means of mirrors reflecting the constantly changing patterns made by bits of colored glass at one end of the tube.

• 万花筒一种管状光学仪器，经旋转可产生连续不断的对称图案。这是由于管一端的有色玻璃碎片经过镜子的反射形成不断变化的图形