definition: one given to fanciful, impractical dreams; visionary.

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“To come down to earth” is, in ordinary speech, to get to reality, to face the facts, and to be practical.¬†On the other hand, “to have your head in the clouds” is to be a dreamer and a fantast, though oddly and curiously, the Christian notion of heaven, the abode of God and therefore the seat of ultimate reality, is traditionally symbolized as a situation where everyone floats in the sky. (Alan Watts, Cloudhidden, Whereabouts Unknown: A Mountain Journal)