Free, open source screen saver run by 1000s. Install on PC or Mac; when computers "sleep", screen saver starts, & computers communicate via web to collaboratively create morphing, abstract animations known as 'sheep;' a collective 'android dream.'
Annual Review of Earth and Planetary Sciences
Vol. 28: 571-610 (Volume publication date May 2000)
(doi:10.1146/annurev.earth.28.1.571)
Scaling, Universality, and Geomorphology
Peter Sheridan Dodds1 and Daniel H. Rothman2