Layers of animation - Foreground & Background

The layers of animationish are much simpler and extremely different when compared to that of photoshop. There are only two layers, the foreground and the background. The background is used to have just what the name suggests, background. Backgrounds don't move and travel around. The foreground, on the other hand is all action. The foreground is where the characters and/or objects move around. Whenever my Piffle or Bob is moving, I transfer them to the foreground. In my animation, the table, grass and sign are always in the background while the other two rotate. I only ever have one object in the foreground at a time or I find that I have difficulty moving them around.