Those are removable for carpet … or maybe addable for hard floors is more accurate. Someone just put them on upside down on the front and then photoshopped out

Those are removable for carpet … or maybe addable for hard floors is more accurate. Someone just put them on upside down on the front and then photoshopped out all context. See https://www.knoll.com/product/wassily-chair https://www.knoll.com/product/wassily-chair