Green Card

Finally got my Green Card or "Permanent Resident Card" today! It looked almost identical to my work permit on the front side, but the rear side is dominated by this high tech holographic area. At closer inspection I could make out my name and portrait, and on the top and bottom edge I can see all the state flags and portraits of all the presidents (click on bottom picture). Looking at it some more I realize that the surface is not holographic at all, but instead similar to a CD. It has that rainbow shine to it, but no depth like a holograph. They even provided a small envelope to "protect your new card".
From the size of the area I think there must be at least 100mb of data.