Time Cube Clock confuses me a bit

You have to admit that this Time Cube Clock just looks cool. I'm not certain how practical it is, for you will need to learn how to tell time all over again.
You see, three triangles are designed to tell the time. The largest does the hours, medium the minutes, and a fast-mover small one does the seconds.
So, what time is it now? I don't know, honestly. I believe at some time in the day, all the triangles will line up to form a nice box shape.
Believe it or not, you can get this device for just $12 at the Chinavision site.
Via Technabob