Instructables

Step 2: Assembly

Take your clean empty bottles, and fill one 2/3 full of water. Place the other bottle (empty) on to the coupler, or use duct-tape to connect the bottles together. Your done! Its a rather brain-dead process which anyone can do, but there is some technique to it as well.

To Make the Tornado:

- Quickly invert the lower bottle (full) to the top, and with a smooth circular motion, rotate the top bottle (full) to make the tornado.
 
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