Concept of a USB sand clock. 3D holographed material inside the glass that you can make changes.
Pick a color, length of time and material and the inside of the sand clock changes accordingly.
desktop type
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Oh my god. What you just invented is called an hourglass. It’s been around for hundreds of years. At least I won’t have to go through the annoyance of having to look at the clock in the lower right hand corner of the screen.
Very interesting, but I don’t see how this is an improvement over the traditional hourglass.
Thanks for the comments. The biggest difference is that you can customize the material inside the glass from the desktop.