Quicksand Fans

He actually consults a physics professor who specialises in soft matter and complex fluids to come up with his mix, and it looks pretty good, especially after he adds more water.

https://youtu.be/jNcFHoFChYs

I'd seen some study a while back that salt helped in these mixtures. I bet with some water jets at the bottom and regular mixing this recipe would probably work really well. Wish he posted his ratios though!!!