This is very original. The only thing I would do different would be a larger depth of field so all of the marbles are in focus. Still, at 10 to me. Good job.
I like the compostion and color. It's hard to discern where the actual "in-focus" point is so my eye doesn't know quite where to focus. Also there are quite a few hot spotsl.
Title needs to be more creative. The shot is simple enough and the viewer does not need to be forced to think a certain way here. (I say this because some shots with "simple" in the title are titled that way to make the shot fit the challenge, not needed here.)