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Clear film straps to mount each of them on an elevated platform of foam center board under a rumpled fabric-covered mat. If one or another is more important than the rest, put it on a higher platform.
The noses or partial face sections from foam manequin heads can help in making a support. I'd still use the clear film straps, but the idea of faces emerging from the background intrigues me.
If you do a truly outstanding job, do you make a spectical of yourself?
I like the noses and eye sockets...
You could make a plaster cast of someones face then just get some floral Green Block and just smack it into the mold.... it will take the shape then you can slice away the extra.
Mylar is good, but I like the strength and long term hold power of fine brass wire. You can feed a loop up through the foam and fabric. Run the glasses into the loop, and pull it tight.
Splay, glue and tape off on the back.
what about suspending them by monofilament unfolded in a shadowbox with glass and sides ONLY- you could take it off the wall and put your face up and look through them!