i like that i can follow the progression of the stack falling over. i would suggest putting up a coloured background to add more contrast. the middle part of the 'fall' almost blends right in with it.
scalvert: falling is Newtonian and natural. I was going to say that the movement of the hand is not natural, but there is no movement of the hand! the hand is only in one exposure.
GeneralE: yes, but that is motion of a sort. To be not there, and then there, and then not there. That is an Individual Will working in the universe. Not natural.
Nice motion blur in the center. I like the wood pieces on the wood table. I think a little could be cropped from the top -- I noticed that as I scrolled the image up to make the comment.
I like your idea here. I think you have gone a step outside of the box from what the others in this challenge have done. But on the same tokem the translucent parts of the image detract from the image. If you had reduced the translucense of the arm and the falling pieces just a bit more I think you would have a real stunner here.
Still it is a great image and one that gets a 7 from me.