“German sculptor Gregor Schneider was fascinated by artwork “Black square”, which was created by famous russian artist Kasismir Malevich, and he decided to create an analogue of it as sculpture.” Link.

Interesting that he proposed this sculpture for the Venice Biennale and then the Berlin Museum of Modern Art, but both times it was rejected at the last minute as it was worried that it might offend Muslims thinking it to be a reconstruction of the Kaaba - the building at the centre of the mosque in Mecca and the holiest place in Islam.

From the blog Mathematical paintings and sculptures.
Some great stuff on there.

First saw this as a link on Boing Boing, it’s worth checking them all out.
There’s lots of good scans here from someone who bought the original artwork.

At least that’s what I think it was.