imagination
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Have your head in the clouds
To be lost in daydreams, impractical, or not paying attention to what is happening around you.
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Pipe dream
An unrealistic, unattainable, or impossible hope, plan, or fantasy.
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Mind's eye
The mind's eye is the faculty of the imagination, enabling one to visualize or remember things that are not physically present.
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Build castles in the air
To dream or plan fanciful, unrealistic schemes that are unlikely to ever come true.
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A flight of fancy
An imaginative idea or thought that is whimsical, unrealistic, or impractical.