Nope, it's not an illusion or a trick -- that's just what it looks like when you suspend particles of a liquid in mid-air using an awesome technique known as acoustic levitation.
Those two pedestals are actually speakers, transmitting sound waves at 22 khz -- just outside the range that humans can hear. By transmitting waves that interfere with one another perfectly, scientists can create points in the wave form where no energy is transferred, effectively canceling out gravit
y at that point, called a node. Pretty cool right? You have no idea -- hit the jump to for video of acoustic levitation doing it's thing, which is totally spectacular.