Job 37:18

Wast thou his co-worker or assistant in spreading out the sky like a tent or canopy over the earth? or canst thou spread out such another sky? Then indeed thou mayst with some colour pretend to be privy to his counsels, and to judge of his works. Which is strong; which though it be very thin and transparent, yet is also firm, and compact, and stedfast, and of great force when it is pent up. As a molten looking-glass, made of brass or steel, as the manner then was.