Vegetable, creature or instrument?

This interesting vegetable appeared in the communal area at the allotment. I feel I should know what it is but need to do some investigating to find out. It reminds me of a strange sea creature or perhaps a musical instrument- the big brass one that is wrapped around the whole body!

Life goes on - a mixture of work, dog walks and trips to tend my allotment. Feeling autumnal and slightly weary. Hopefully the long weekend will be a boost - it is the August bank holiday here in the UK.