As much sacred geometry as I've seen in street maps and also in the design of religious and 'pagan' spaces - this one was a startler I must tell you. It's obviously a giant eye right in the middle of Barcelona!

It reminded me of the two eyes in the square where I used to live in Brighton, UK. Brunswick Square has two eyes, but also a serpentine (Serpent) stretch running in between them. 

Being the symbolmaniac that I am, this is all quite thrilling!