Definition of "glass ceiling" []

• An unacknowledged discriminatory barrier that prevents women and minorities from rising to positions of power or responsibility, as within a corporation. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The event was scheduled after nightfall because the designer wanted dark skies over the glass ceiling in the Grand Palais – all the better to show off his neon-outlined set, complete with perspex street lights and twinkling black floor."