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I would call this design a machine of amazing simplicity.
1.Materials: wheels, bottle, ball, rubber, tube
![](http://img.uaft2404.org/img/sdela-2019/mashinka.jpg)
2. Insert the ball with the tube in the bottle in this way:
![](http://img.uaft2404.org/img/sdela-2019/mashinka-2.jpg)
3. Inflate the ball through the tube.
4. Hold the end of the tube:
![](http://img.uaft2404.org/img/sdela-2019/mashinka-3.jpg)
5. We release the phone and the car goes.
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