Van Buurenmonument in Amsterdam

You're standing in the little park at the heart of the Coöperatiehof, a housing complex in Amsterdam-Zuid. Look at the middle of the green. There's a large sphere on a short base. That's the Van Buuren Monument. It looks a bit like a globe, so now glance down at your feet. The base sits on a compass rose, and the whole thing stands on a round patch of brick paving.