Photographer Andrew Hall experiments with how liquids and gases interact with each other, using other influences such as sound waves and magnetic fields to produce abstract photographs.

To create the effect he pours ferrofluid, which has nanoparticles of magnetic material suspended in it, into a container three millimetres deep. Then he applies a magnetic field underneath while adding drops of pigment, such as paint or ink, which mixes with the fluid. "If the magnet's close, the fluid tends to go into spikes, but as I move it away, it morphs into the beautiful organic pattern you see here," Hall says.

In another series, Shooting Music, he plays with the same idea but the liquid, usually water, morphs in response to sound waves played through a speaker. Sometimes the music will be melodic; other times Hall will play a single, humming tone, causing the liquid to vibrate. "It kind of dances with the music. It's staggering stuff," Hall says.

Hall has been experimenting with liquid and movement for four years, and he's only scratched the surface. Anything can change how the fluid behaves, including the density of the liquid or even the shape of the container itself, but once the photo has been shot, what you see is what you get. "It can work with the spoken word. There's no limit to it - it's like making sound visible."