Illustrations to Young's Night Thoughts
Blake sees man looking into his own Bosom with his spiritual eyes and having a similar experience of discovery. What he sees is not the persona or image which he presents to the outside world. He sees his Heaven, his idealized image of himself and his world as it would appear if his doors of perception were cleansed. His Earth is also visible to him: the ruin of a man in a ruined world.
Jerusalem, Plate 71, (E 225)
"as in your own Bosom you bear your Heaven And Earth, & all you behold, tho it appears Without it is Within In your Imagination of which this World of Mortality is but a Shadow."