Short process video: https://youtu.be/d8SRYHGZTsk
A hinge is just a piece of paper joining two other pieces of paper. I use a heavier-weight paper, scored and folded. You can score with a straight edge and a pencil or pen with the lead / point retracted, and fold against the edge of a table.
Junk Journal July hosted by @megjournals.
Papercraft Crystal 