What joy to discern the minute in in?nity, the vast to perceive in the small, what divinity Jacob Bernoulli (1654-1705) in Ars Conjectandi (1713) We are proud to present to you the proceedings of the Sixth International C- ference on Cellular Automata for Research and Industry (ACRI 2004), held in Amsterdam, The Netherlands on October 25 27, 2004. Since the ?rst conference in Italy, ACRI, which is held biennially, has become the premier conference in the ?eld of cellular automata in Europe and beyond, and is still growing in quality and size. This year s theme was From Individual to...