Through Optic Glass

…his ponderous shield
Ethereal temper, massy, large and round,
Behind him cast; the broad circumference
Hung on his shoulders like the Moon, whose Orb
Through Optic Glass the Tuscan Artist views
At Ev'ning from the top of Fesole,
Or in Valdarno, to descry new Lands, 
Rivers or Mountains in her spotty Globe.

-- Milton, Paradise Lost, Book I

Milton visiting Galileo, colored engraving after a painting by Annibale Gatti

Galileo's drawings of the moon, 1610