|Duration:||2' or longer|
|Instrumentation:||2 variable groups of instruments|
Zandloper ("hourglass") does exactly what it describes: an amount of material travels from one side to another, within a fixed span of time. This process happens systematically. Over time every different combination of divisions is exploited. Hourglasses may be reused indefinitely by inverting the device. This is also the case here.
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