I grow up with Soviet Design.Generally it was pretty depressing experience.
But there were some examples I find almost genius.
This is one of them:
In Soviet time all dairy products were sold at the same type of a glass bottle. To find out what is in a bottle you could because of a cap. The silver one was for milk, but the green one was for kefir, for example. The glass bottles were collected after . So, the only one thing you needed to produce again, was a cap.
Kids use to collect the caps and play money games with them.
A picture via Шедевры рекламы