That was my initial guess, too, but a) IMO, that is borderline furniture and b) it would surprise me if it were typically Dutch. Google gave me zillions of patents for milking stools (bucket attachments seem popular), but no definite answer to the latter question.
I've read the article you've referenced but am unable to find the furniture you mention. At which page should I look?
Last page, third-to-last paragraph. (i.e. Figure 10, Page 2 of van Emde Boas's response.)