Dharma Initiative “Black Light” Map
An image of the “map” on the blast door of the Swan Complex that was revealed when exposed to a black light.
A larger version (with better contrast, coloring & sharpness) than what I can currently find online.
Click the image or here for a full size (quite large) version.
OUTSIDE LINK: An allegedly “officially received” version of the map, with clarified text & notes.