Spikes to keep the pigeons away? The tilted lines and curves remind me of something very different I took last year - will have to post it. This is a fascinating combination of shapes - an "outdoor building" of some sort?

This is a subway entrance, Bob. The glass roof is mainly for waiting put rainstorms.

Thanks.

I uploaded the cirves and diagonals shot I was thinking of - not really much in common after all.

It's a great photo, though.

Great mix, splendid cocktail of man made objects.

Thanks, Jose.

A terrific combination of forms, lines and curves!

Thanks, Rainer.