Sorry for the bad pun (and forgive the enthusiastic background music). This is incredible.
This process seems similar to non-newtonian substance called Oobleck (word coined by Dr. Suess in Bartholomew and the Oobleck). Wikipedia has more info. The image below is from an Oobleck experiment in an art class that Liz and I taught last summer.
Note: video originally posted with article here
nice!