ivory tower(n = noun.cognition) - 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"
is a kind of cognitive state, state of mind

bell tower, church tower, clock tower, conning tower, control tower, cooling tower, eiffel tower, fire tower, ivory, ivory black, ivory carving, ivory coast, ivory coast franc, ivory gull, ivory nut, ivory palm, ivory plant, ivory tree, leaning tower, leaning tower of pisa, martello tower, mooring tower, observation tower, shot tower, supporting tower, tower, tower above, tower block, tower cress, tower mustard, tower of babel, tower of london, tower of pharos, tower of strength, vegetable ivory, water tower