The view from the London Eye takes in many of London's best landmarks, but one notable feature hides in plain sight.
Peer over the top of the County Hall building, just to the south, and you'll see this curious structure.
This office annexe is peculiar in having a 12-sided — or dodecagon — plan, just like the new pound coin.
The only other London structure we can find to have 12 sides is this ice house in Home Park, Hampton Court.
The shape can also be glimpsed in the roof light of Brent Civic Centre in Wembley.
Seen it anywhere else in London (apart from your wallet)?