This is such an amazing idea. It is called the Trace of Time. It is a huge wall clock on which you can write small notes next to the time of your appointment and then as the needle falls on the time, it erases it. It is made of glass and it wipes away the notes on the deadline with its eraser. This way, you will make sure you keep your appointments as you wouldn’t want to be missing on anything important when you know it will be erased if you don’t do it. How smart is that? Very, methinks! Way to go Il-Gu Cha.

[Engadget]