Polyphony and monophony in instruments harpejji and the Chapman stick). Multiphonics can be used with many regular wind instruments to produce two or more notes at once, although this is considered an extended technique. Explicitly polyphonic wind instruments are relatively rare, but do exist. The standard harmonica can easily produce several notes at once. Multichambered ocarinas are manufactured in a number of varieties, including double, triple, and quadruple ocarinas, which use multiple chambers to extend the ocarina's otherwise limited range, but also enable the musician to play more than one note simultaneously. Harmonic ocarinas are specifically designed for polyphony, and in these instruments the range
Stations of the Resurrection any Church authorities sought to impose a definitive list, and as a result some churches have commissioned sets of sculptures for the Stations according to their own distinctive scheme which may not be followed elsewhere. (This is similar to the history of the Stations of the Cross, which attained their normative form only after many centuries of widely varying local practice.) As to the "number" of Stations, however, there is general agreement that in order to emphasise the complementarity between the Stations of the Cross and the Stations of the Resurrection there should be fourteen Stations of the Resurrection, as