imaginarystructure
nounA structure is a thing that is built, and imaginary means it is only in your mind, so an imaginary structure is a building you make up in your imagination.
The children drew an imaginary structure with towers and bridges that could never be built in real life.
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OTHER MEANINGS
2. A made-up framework used in stories, games, or art that does not exist in the real world.
The game world was filled with imaginary structures like floating castles and crystal towers.
3. A theoretical or conceptual arrangement created in the mind to help explain ideas.
Scientists sometimes use an imaginary structure to help them picture how atoms fit together.
4. A pretend building or object in a child's play that has no physical form.
Using blocks and blankets, they built an imaginary structure and called it their secret fort.