I have subscribed to Harper's Magazine for as long as I can remember - probably since the last glacial maximum - primarily for the challenge of solving the monthly cryptic puzzle.
Embedded above is one of the most challenging ones I have encountered in recent years. To solve the puzzle you need to fold the pattern into a cube. Then the entered answers may be entered normally or backwards.
It took me three evenings to suss this one out (when I'm stumped I prefer to walk away and hope my subconscious will work on it while I do other things).
No spoilers here, but if terminally frustrated puzzlers want to email me at the blog's address in the right sidebar, I can offer some subtle suggestions to get you jump-started.