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The interior of each structure is filled with wood, and, about a week before Christmas Eve, the outside is covered with cane reeds, wired in place.

The sails are made of cane reed woven together like a mat, which, when they put into port, they leave standing in the wind.

So, out of safety concerns, authorities are taking 5 feet off the permitted height of the bonfires this year, bringing the log structures wrapped with quick-burning cane reeds down from 20 feet to 15 feet.