"Glass is an alchemic blend of sand and metallic oxides combined with extraordinary, blinding heat. The result is a material that flows and drips like honey. When it's hot, glass is alive. It moves gracefully and inexorably in response to gravity and centrifugal force. It possesses an inner light and transcendent radiant heat that makes it simultaneously one of the most frustrating - and one of the most rewarding - materials to work with"
via joshsimpson.com
