A stationary set of chromatically tuned bells in a tower , usually played from a keyboard .
排钟，钟琴塔楼里一套固定的乐器，通常在键盘上演奏。
The shimmering picture above is the result of two images - of the same subject but slightly offset from each other - which are then changed into chromatically opposite colours ( like red and green ) , with one superimposed upon the other .
