The LED Hourglass Lantern is a modern day twist on a concept that dates back to ancient times. Take an hourglass, remove the sand and replace it with modern LED lighting and you have an unusual gadget. That is the concept design developed by Young Bok Kim.
When the LED Lantern is flipped over, luminescence slowly decreases in the top chamber and increases in the bottom chamber, signifying the passing of time. Of course, being a gadget from the modern era means that there is some flexibility built into this cool lantern. For instance, the rate at which light (sand) flows can be adjusted to meet your needs.