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Eureka
Eureka - Having been inspired by Archimedes' Principle of Buoyancy, I decided to design a coin box which would efficiently be used after the introduction of new turkish lira into the market. Eureka is basically made up of two boxes. The small one floats inside the big one, which is filled with liquid. By putting coins in the box, the small one will sink causing the rise of the water level, which indicates the amount of money saved inside the coin box.