Pet Tornado: a swirl of the wrist conjures up a white vortex in this classic Tedco science toy. Although the twister dissipates after only a few seconds, each one is dynamic and intricate. I love how the design uses printing on both the inside and exterior of the cylinder to create the look of a field in Tornado Alley with buildings in the foreground, and provides contrast to see the whirlpool. Some tiny glitter and drop of bubbly detergent provides markers in the fluid to help reveal the motion