Look what I found while surfing around the website of the Centraal Museum in Utrecht, looking for more info on Piet Klaarhamer, Gerrit Rietveld's mentor and De Stijl collaborator.
It's a cradle! More importantly, it's a cradle on wheels, like a wheelbarrow. This feels good to me. As good as the big arched cornice feels bad. But whatever, it was 1910; De Stijl was not even a twinkle in Klaarhamer's eye at that point.
Wieg/Cradle (ca. 1910) P.J.C. Klaarhamer [centraalmuseum.nl]