“… we quantify happiness levels on a continuous scale for a diverse set of large-scale texts…”
Dodds and Danforth. Volume 11, Number 4, 441-456, DOI: 10.1007/s10902-009-9150-9 :

“…a visual represention of a text [Alice in Wonderland]—the entire text (twice!) on a single page. A funny combination of an index, concordance, and summary; it uses the viewer’s eye to help uncover meaning.”