Source: Pennsylvania Tunnel and Terminal R.R. by Pennsylvania Tunnel and Terminal Railroad, 1910.
Find the Hidden Parts of Night-Time Dreams
Image source: The Beauty of the Heavens by Charles F. Blunt, 1842.
Are You Willing to Allow the Footsteps
Image source: Surgical Anatomy by Joseph Maclise, 1851.
Mental Whirlpools
Image source: Whirlpools by Henryk Sienkiewicz, 1910.