A giant Rubik’s Cube? An early modernist-style building? We weren’t sure what to make of this photo taken on the NIST campus in 1911. Turns out it was a two-year exposure test of 300 panels made of various stucco and plaster formulations. Stucco and plaster house construction was popular at the time, but a number of reported failures of this building-type led NIST to be asked to test the durability of these materials and their construction methods.