From Information Aesthetics:
The newest creation of Boris Müller, famous for his (yearly reoccuring) poetry visualizations: online, interactive applications that are capable of visualizing textual input into very beautiful graphics, so that every image is the direct representation of a specific text, which can then be directly used as book illustrations.
this year, an entire poem was considered to be a tree-like structure, that branches out over the page. attached to these branches are the words of the poems, represented by leaves. more specifically, particular symbols in a text control the growth of the tree: specific letter-combinations create a new branch, others make it grow stronger. words are visualised as leafs: the amount of letters in a word is represented by the number of spikes on a leaf, whereas the letter sequence in a word also controls the overall shape of a leaf, such as the roundness of the shapes, the length of the spikes & the density of the colour. the size of the leaves depends on the length of the poem.
More here.