Apparently in this video there is some kind of speaker hooked up to this black platform. On top of the platform is a bunch of white rice. The speaker starts at a low pitch whining sound and each different change in pitch of the whine causes the black platform to resonate at a difference frequency (or at least that is my guess as to what is going on). The different resonance causes the rice to form different patterns on top of the black platform. This reminds me of the video of the corn starch being vibrated at a high frequency.

Check out the full video of the vibrating rice below or click over and view it on the host site.

Source: YouTube