bratticus wrote:I thought "glass ceiling" implies that it's not visible until you bump into it.
That is part of it, usually in the past I have seen it used to describe difficulty people of a gender, race, or education level have of achieving leadership posts (or high income).
Until the first female CEO's managed to get the job of CEO, or the first 'American of African descent' got to be Mayor or Governor or President there was said to be a 'glass ceiling' on what they could achieve.
I think for Peak Oil it is not apropos because once we hit geophysical peak there is no way to shatter the ceiling and go higher as has occurred for the social limits usually described by this analogy.