Take a look at these amazing demonstrations of Ferrofluid, a material which is a liquid but is also attracted magnets. It is both beautiful and creepy to watch liquid behave in gravity defying ways. In some cases it looks almost organic.
Ferrofluid is a very interesting material originally developed by NASA it has now found itself been used for a whole range of devices including dampers for controlling and stabilizing large building that move around in the wind. Whats also amazing is that they have such lovely visual qualities when magnetized.
There are a number of great pictures and videos here. By taking an artistic approach to this substance, there's some really interesting and strange imagery to be seen here.
Link (via Fazed)