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Dome
Definition from Cambridge Dictionary.
a shape like one-half of a ball:
”a rounded roof on a building or a room, or a building with such a roof
![picture of dome](https://dictionary.cambridge.org/images/thumb/dome_noun_002_11230.jpg?version=5.0.115)
How REALISTIC is Sandy’s Tree Dome? 🐿 SpongeBob Deep Dive
Video Attribution: SpongeBob SquarePants Official (YouTuber’s YouTube Channel).