• We live in a glass-soaked civilization, but as for the bird in the Chinese proverb who finds it so difficult to discover air, the substance is almost invisible to us. To use a metaphor drawn from glass, it may be revealing for us to re-focus, to stop looking through glass, and let our eyes dwell on it for a moment to contemplate its wonder.

    Alan MacFarlane, Gerry Martin (2011). “The Glass Bathyscaphe: How Glass Changed the World”, p.4, Profile Books