Ferrofluid

This video is interesting to me as it presents a possible way i might be able to capture energy in my work. It looks as though magnets behind the canvas/board/surface are manipulating and moving the ferrofluid about. This technique if automated may be able to capture the essence of energy on a canvas

ferrofluid 1.2 (6'54") from ACRETION on Vimeo.

http://www.popsci.com/diy/article/2009-09/making-ferrofluids-work-you