*CURLING RIBBON, sorry. I was delirious when I posted this.
This has probably baffled me *since* I was five. What is this sorcery?!?
In: Physics
There is a german tv series “sendung mit der maus” where they explain stuff for children but everyone generally knows and likes it. They gave some generally accepted reason for your phenomenon which was to some degree incorrect, but the RWTH aachen contacted them and said they were wrong and invited them over and together they made another episode with SEM microscopy and explained everything and its due to small bumps that form in the polymer of the ribbon which causes the tension for the ribbon to stay in that shape.
Video:
https://m.youtube.com/watch?v=GEyXzm-Y0-I
Its on german unfortunately but if you watch it from 4:00 minutes on you will see SEM images (special form of microsopy) of what happens to your ribbon on the small level 🙂
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