As usual with glass, it's hard to get the whole story from a photo.  What's going on here is that the glass is indented, like a bas relief.  This is sooooooooo much fun to do!

The pattern is traced onto 1/8" thick fiber paper, then carefully cut out and put under a piece or two of 3 mm art glass.  The glass is fused, the fiber paper is removed....and you have a bas relief!

My next goal with this is to try to get more dimension to the graphic.

The liberty bell is my favorite of the ones I've done, but here are photos of the others: