See silent video
(15:27)

"Visable and invisible motion merge along a continuum at 
about 20 cycles per second." 
"Sub-audible vibrations may be experienced as periodic and rhythmic 
motion, like a leaf oscillating in the wind."
"Audible vibrations are an "invisible" form of periodic motion and are 
experienced as sound." (Cyclical Motion: Ten Truisms)

December Quivering is a study in sub-audible motion in nature. The piece was filmed in the yard near Dan Senn's Tacoma studio in 1998, in the local northside neighborhood, at the Point Defiance Sound Garden, and at a nearby city nature preserve. The piece is mostly unedited with scenes presented as they were shot. The version is presented here without sound but has often been accompanied by Dan's auto-playing soundsculptures, and live improvisations during performances. It has been viewed throughout the United States and Europe.