Magnetic liquid: http://www.supermagnete.de/eng/FER-01?adwords_de_eng_magnet&gclid=CIL04MebhKACFUIA4wodInlakw
These liquid sculptures are really cool, thick black ooze reacting to magnetic fields to create forms. I think clever use of mograph and metaballs could produce a similar effect in 3D to make a more fluid animation to relate to different materials used by studios in the Mill.
More examples:
http://www.kalenzo.com/2008/07/ferro-fluid-art-dynamic-metalic-fluid.html