People passing by this building in Houston may have wondered whether it had suddenly turned into a black hole, or was the setting of some kind of explosion that defies the laws of physics. In fact, the strange tunnel was an art installation called ‘Inversion’ by Dan Havel and Dean Ruck, which was created just before the building was due to be torn down and replaced with a larger structure. The tunnel actually goes all the way through the building, ending in a private courtyard.
