http://content.tfl.gov.uk/station-design-idiom-2.pdf

I haven't read the whole thing, but I'm laughing already.

"Oxford Circus Underground station directly connected to diagonal
crossing above" - since the station has an entrance on all four corners,
the existence of the crossing has no relevance for the station.

"These images show the power of the rectangle as an adaptable ‘frame’
for commerce." (alongside pictures of various rectangular adverts and
shop doorways). Wow, that's pretty heavy, man.

I know, I'm being Mr Negative.