Wow. This is really awesome. The depth of field is stunning- the marble stands out from the floor around it, it has a sense of reality that the rest of the picture doesn't.
The light from the window creates a soft, natural border around the picture, which I really like, because it helps to showcase the off-centre composition. I don't know if it was intentional, but the sphere just touches the centreline in the same way that it just touches the floor, giving the marble a weightlessness.
In terms of composition, though, I would probably have had the marble lower in the picture, contrasting with the lighter areas at the top, adding to its feeling of reality.
It's hard to interpret this, as with all your photos, but, personally, I think the key is in the way the painted plant reaches out from the dark side of the sphere to the reflected window, just like a real plant reaches out to the light. I dunno, maybe it reflects how organic life always dreams of and stretches towards a higher sense of reality that's always unattainable. Again, that's a pretty subjective view.
I've been meaning to comment one of your photos for a while, because they're all so inspirational. I think the reason I chose this one is because it's a departure from your standard floral macros (though I would argue it's still a floral macro, just an unusual one) in it's minimalism, and the lack of unnessecary detail really gives it it's strength.