What's the time

I made this clock for my kids to learn the time.
I saw this somewhere, not my idea, but I can't find who it was from..

It has some design flaws that I will repair when i will have time for it, but for now it's just fine.
Todo:
- Rotate numbers so they will all face the right way when you rotate the cube
- Pockets for the cube should be slightly slanted down at the back so that cubes wouldn't fall out when the clock in vertical - now they fall out if you shake the clock
- On the flat parts of the cube there should be a recessed area for custom stickers (maybe pictures of what happens in certain times of the day..)