What Are These
April 26th, 2008 by Shanghai Daily

….They are on the roof as you can see and I have no idea what they have been used for, or maybe are still used for.
Let me know, if you know.
Picture taken near the Bund
Posted in Shanghai Cafe

Those round things look to me like some kind of air conditioning system. They are quite old though if that is what they are.
Nice shot.