The goal of this competition is to produce, presumably by evolution, 2D tiling patterns with no gaps or overlaps, with the initial targets being the known tilings that are available in a public database. The competition apparently originated in work in evolutionary art, but it may be relevant to other image processing applications as well.
About the GPEMjournal blog
This is the editor's blog for the journal Genetic Programming and Evolvable Machines. The official web site for the journal, maintained by the publisher (Springer) is here. The GPEMjournal blog is authored and maintained by Lee Spector.