A steel ball forms interesting patterns.	A steel ball "writes" interesting patterns in sand.	And that's how the patterns are made.	The famous watch in Questacon.
The patterns seem to rotate without spinning.	Jie experimenting. Stay on one leg and	Take a thin layer of soap water,	Beautiful pattern caused by a thin layer of soap water.
How to create a tornado. Just a tiny one.	Interesting lightning show.	How to create a tornado. Just a tiny one.	Some more lightning.

Visit of Questacon with my friends Jihui and Jie, Canberra, 07.06.2015