The metaphorical dwelling place of those who are detached from the realities of every day life e.g. some academics.
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[n] a state of mind that is discussed as if it were a place; "he lived in the ivory tower of speculation"; "they viewed universities as ivory towers"
cognitive state, state of mind
adytum, ashram, cell, cloister, den, hermitage, hideaway, hideout, hiding place, holy of holies, lair, mew, privacy, recess, retreat, sanctum, sanctum sanctorum, secret place