[Bunk]

After having thought about this design quite a bit and hearing from the architect, I'll weigh in my opinion in a little more depth.

I think what attracts me most about this design and all contemporary architecture that I like is that it is fundamentally about its functionality. It seems very clear to me that the dual objectives of maintaining a low height and creating a clear span across the river really drove the design and engineering response. Couple with that is an obviously clearly thought out approach to best accommodating the user - which is cyclists, bladers and pedestrians.

- The flat profile is due to its height restriction, but also to make it as accessible and easy to use as possible.

- It has a clear flat span, which requires a strong, straight, very rigid structure - which drives the decision to use a helix as its structural element.

- It is wide with separated lanes for different users, reducing congestion and improving safety.

- The straightness of the bridge also is much more direct, user friendly and likely ultimately safer for bikes whipping around pedestrians in a semi-enclosed structure.

- There isn't any feature without purpose, there isn't really needless adornment.

- The Helix in turn adds the potential for weather protection, unique lighting opportunities and a damn unique user experience moving through it. It's like a space warp or something.

- All these functional moves add up also to something that is quite beautiful as well - which I think is his true brilliance.

As Calatrava said, structurally, this is one of his most demanding bridges ever, and I think those challenges, constraints and functional considerations ended up as a brilliant design. Colour me impressed, Calatrava is a master.