I'm fascinated by the other-worldly "liquid calligraphy" by Ruslan Khasanov. His technique is a bit of a mystery, but I surmise it involves stop motion photography of inky letterforms, on very, very wet paper. The eventual dispersion and disappearance of the inky shapes on the wet paper surface, are captured through stop motion frames (one can detect slight shifts in the placement of the inky subject from frame to frame). The resulting images are then made negatives (I think) giving us these amazing white on black effects.
Long live experimentation!
PS Is it just me, or is the animated gif experiencing a refreshing rebirth as of late?