This is geo-art:
As you can see, geo-art is the arrangement of cache-icons on the map so that they create a certain design. The star and the 3 are in Alabama, but you can find geo-art all over the world. Check these out:
This past weekend, we had a blast solving the puzzles and finding the caches hidden in the Batman series. These caches took us to a beautiful bit of countryside in Clay, Alabama. What kind of geo-art do you have in your state/country?