Step 2: Explanations
Well, I felt forced to consider designing them on my own laser cut wooden articulated glasses, great!
I studied how usual (metallic) glasses hinges were designed to try and replicate these my way.
It came out naturally that the stems and the frame would be vertical parts, whereas hinges would be cut horizontally. (Don’t hesitate to comment this below if you don’t agree!)
The challenge was also to joint the hinges with the stems and the frame in a way that would be as elegant as possible: not too big, but sufficiently robust to make the glasses useable.