Discovered this large, papery ball under the trees in my yard. It’s light as a feather and completely hollow inside. Is it an egg?

apple galls, they are primarily induced by the larvae of tiny wasps from the Cynipidae family. These galls can vary in size, typically ranging from 2 to 4 inches in diameter, and are lightweight due to their hollow interior.
Oak apple galls are named for their superficial resemblance to apples. However, they are much lighter and have a distinct papery texture. The gall forms as the tree’s response to the wasp’s egg-laying process, creating a protective structure for the developing larvae inside. While they may seem out of place in