The Dutch graphic artist Escher was best-known for his mathematically-inspired works that reflected his fascination with order, symmetry and spatial logic. Escher played with architecture and perspective to create impossible spaces.
Sadly my first order of this print arrived with smashed glass (the package had clearly been knocked about in transit, with a massive hole in the side). Phoned to report the breakage, a human (!) answered the phone almost straightaway and a replacement arrived very quickly - I went for perspex just in case, and you can tell it isn't glass from the slightly wavy reflection. Still looks great overall though.