Wide Angle Wednesday: Trompe-l'œil corner

"Corner" is today's challenge hosted by osuzanna and I have taken some shots, which didn't really convince me at first. Suddenly I realised, that there is a trompe-l'oeil effect in this shot. Do you find it ?


Looking at the upper corner in the middle, there is some ambiguity if the railing is facing towards or away from the viewer.