Back of the Cd

[Midian]

On the back of the Lateralus CD, if you press you finger kinda hard and slide it around, it makes a kind of imprint around it , like theres a liquid in the back case, maybe in the spiral threads inside the plastic. I've noticed this with mine and two of my friends. I was wondering if anyone else seen this. Its kinda like those old puffy stickers that had that iridescent shit inside them that you could move around w/your fingers. or maybe its just a defect--anyone know?

[The Umbrello]

It's just the same kind of plastic that was on the booklet. There are air bubbles in the back; if you pull the back plastic cover off to see underneath you will find that it's just air bubbles.