Fabric circles - Studio Journal

I am working with my studio journal
I found those discs as embellishment on a balcony in my town
They are looking a bit like gear wheels - as DH stated (no wonder as a mechanical engineer)
But anyway they fascinate me because each one is looking different
Certainly somebody had an interesting idea many years ago.
My sample is completely machine sewn

Stoffscheiben - Die Verzierungen an einem Karlsruher Balkon haben es mir angetan. 
Diese Arbeit gehört zu der Ausarbeitung meines Studio Journals - ein Kurs mit Sharonb