To clarify the scope of the puzzle: the pink block has to remain on the left and the blue block on the right, and it can't ever enter the 1-square wide tunnel or you will get trapped. The problem you're really trying to solve is how to move the block down once you've got it above its target.
If you weren't hologram-proof on that level, what would you do solve it?
Is there anyway to achieve the equivalent of the above using what you've got?