The Michelin Green Guide says those hollow pyramids between the two church towers are called dubes. They are octagonal and they date back to the 12th century. Michelin says dube is the name for the traditional pyramidal covers on baptismal fonts. Personally, I don't think I've ever seen any other church built that way.
Great view with fantastic autumn colours.
Ken: Thanks for passing on the French Michelin guide stuff. We only have it in English. It says that these octagonal pyramids were commonly used on belfries, kitchens (eg Fontevraud) or lavabos in monasteries. It does seem to be a unique example on a church, so far as I know. Gaynor: this was taken in mid-September, so autumn colour was only just starting. There are a couple of lovely purple leaved trees in the photo though, and the view is fab, isn't it?