"To hold, as 'twere, the mirror up to nature." — Shakespeare
Francis Bacon was involved with building in the human mind 
a replica of the great globe-the earth itself. He was intent
on holding the mirror up to nature, and the mirror he held
up to nature was the human mind. Bacon wrote :
"God hath framed the mind of man as a glass capable
of the image of the universal world, joying to receive
the signature thereof as the eye is of light."
Bacon's mirror was a crystalline globe, and Bacon called 
his model of the world-The Intellectual Globe.
see Mather Walker's Six Part Essay : Metaphor, Allegory, & Allusion

SirBacon.org - Sir Francis Bacon's New Advancement of Learning