It is a wasp nest made by a solitary queen wasp its made from wood pulp.
She either abandoned it,never laid eggs or they never developed if they had hatched they would then continue to build the nest and more brood chambers and so it goes on.
"A society grows great when old men plant trees whose shade they know they shall never sit in."
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She either abandoned it,never laid eggs or they never developed if they had hatched they would then continue to build the nest and more brood chambers and so it goes on.