The Paper Ceiling

Have you ever heard of the Glass Ceiling? The Glass Ceiling Congressional Commission defined it as "the unseen, yet unbreachable barrier that keeps minorities and women from rising to the upper rungs of the corporate ladder, regardless of their qualifications or achievements." Multiple spinoffs describe the invisible barrier in other professions and groups; including the Brass Ceiling (law enforcement and military), the Bamboo Ceiling (Asian Americans), and the Gray Ceiling (the lingering baby boomers keeping younger stock from moving up).  Now that we are familiar with the Glass Ceiling can you guess what the Paper Ceiling is?