The Fledermaus Chair. I too now along with N-A will be looking for one.
You didn't bore me in the least!!! I like these images with the chairs and now will see them slightly differently. It's nice when Nagel used an object to show a woman's power (at least the second image exudes that for me) or when he used it to show playfulness like the "N" image with the telephone and a woman smiling, something else he rarely allowed (a smile).
As for the second image, I believe you might be right, but another fun idea is she is standing and resting during her workout set inside a veritical knee raise machine. (I always pictured her working out since she was wearing a bikini type bra and headband).
It's fun to wonder. Thanks for your lovely post.