In a life long ago I was also a teacher ... mostly math at Junior High/ Middle School or High School.
You can easily make your own Escher designs fairly easily if you are talking about something like the birds design.
Start with a square of paper. Whatever you subtract fom one side or cut away you put on the opposite side. so those sides will snug up close. My kids loved doing this in math and in JH/MS did the coloring or design in art class.
Hope this is clear, if not, let me know.\
ali