These pictures depict something nicknamed as the bum tree, for obvious reasons. A friend of mine, Heath, discovered this, so you can blame him.
For those that would like to visit the tree, you need to walk down the trail by the Obahn Busway, from Tea Tree Plaza (at Modbury) towards Adelaide. The tree is in around the middle of a park (the first park you walk through), as you head down that trail. If you're that keen, I've made a couple of pages that show you how to visit the bum tree.
Photos by Tim (23-Nov-2001).