Yesterday I was lucky enough to find one remaining Sisal Log at a Garden Centre. These make excellent nesting logs for the Barbets and Woodpeckers. A small hole is made with a machine tool but the bird has to do the rest by pulling out all the inside fibre until it is satisfied with the space for a nest.
I tried to see inside the lantern, but I guess the hot birdy breath had steamed it up. A friend had an 2nd story terrace with a wicker shade over the patio bulb. A bird had built a nest in the shade & dangling from it was the delicate string & paper tag from a tea bag.