Musique électronique / sur support / instruments mécaniques (Musique électronique / sur support / instruments mécaniques)

Instructions : 

0 choose between two and eight speakers 
distribute them freely in the available space 
assign each of them its own audio channel 
1 create the same number of audio buffers 
2 choose a length of several seconds or minutes for the buffers 
3 fill each buffer with a sine tone 
// choose frequencies and amplitudes according to taste 
4 play back the buffers looping in sync 
5 in regular intervals 
choose a segment of time 
choose two of the buffers 
swap content

(source : http://www.roberthenke.com/installations/ritual.html )