This is called "reversing!!"

I like reading in the main library of UCL. The classical environment is so quite and academic.
And I read some art design book and found this artiest Richard Wilson.
Because I saw it is just a serious photographers and thought this is just some digital composes initially. However, I search this guy and his work, it totally shocked me!
It is a real device and can moving different angles.
The thing that I only can say “This is totally reversing!”
From the viewers to the building itself.