1
general::
A place or attitude of retreat, remoteness from everyday affairs, as in What does the professor know about student life, living as he does in an ivory tower? This term is a translation of the French tour d'ivoire, which the critic Saint-Beuve used to describe the attitude of poet Alfred de Vigny in 1837. It is used most often in reference to intellectuals and artists who remain complacently aloof.
American Heritage Idioms