Update

Got some good feedback from Prof. Anderson, which is a relief.
I was really happy with what I had, but I wanted to make another model.  Which, by the way, is not so simple.  I've never used sculpey so I didn't realize how tough it was to mold.  I made this one a bit bigger.  I actually think this one is more successful than the first.

Made the sun on top of pyramid.  Acts also as a pull to open the box.

This model is longer and taller than the first, but the ring is still able to stand up in the center.

My primitive model of the outside container.  This will be disposable.
Has cutouts  on the sides that resemble the geometric shapes found in aztec art,
it also looks like the pyramid.  Really driving it home.