Authors:

We pledge to fight 'blue-sky thinking wherever we find it. Life would be dull if we had to look up at cloudless monotony day after day.

Gavin Pretor-Pinney (2007). “The Cloudspotter's Guide: The Science, History, and Culture of Clouds”, p.11, Penguin
We pledge to fight 'blue-sky thinking wherever we find it. Life would be dull if we had to look up at cloudless monotony day after day.