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How does the water from the Nile vase work?
    The vase has a double wall, and there is a small hole in the inner wall. Fill the vase with water, and gradually the space between the inner and outer wall will fill with water. You can then empty the vase, but after a few minutes you will find there is more water in the vase. Water is slowly trickling from between the inner and out wall through the small hole, into the main vase.