It looks like they're additive, and being welded on. Definitely very cool to watch how it's done. It'll be nice to see this feature greet arriving rail passengers with some pizzazz. I liked how the new Causeway entrance at TD Garden nearly accomplished a similar feat. Hopefully Back Bay Station's redevelopment adds some similar 'wow', too.
+1. Architecture - - especially highly visible public architecture - should be a statement. I love this part of this project far more than the anonymous blue glass tower. THIS is the part that most humans (particularly visitors) will see as Boston.
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