Farmville Hay Bale Stacking

This is not real stacking. It's just an illusion, an original way of decorating your farm.
Stacking is impossible in FarmVille, at least so far.

Further detailed:
The isometric system of this game allows the user only one level of stacking, therefore we have to trick it to make it look like there are several levels.

Code-wise there is only one level, but graphically you can stack as many as you want. And that, out of both, is what most of us people are focusing on this game, visuals, which actually seems to be the proposed objective of the game. That is, we don't care about where the bales are actually placed, we just enjoy the aesthetics of it.

Therefore it's no matter the actual fact of bales being stacked or not but, as it seems like they are, we can call it so with no doubt, as that is the whole point, that it looks like they are stacked.
Hope I cleared it now. Anymore comments you propose ill be happy to talk about.