Thought this was a good article... very intrigued with the concept
http://www.texascooppower.com/content/detail_keyhole_comp.jpg
A keyhole garden is the ultimate raised-bed planter. It is often built in the shape of a circle measuring about 6 feet in diameter that stands waist-high and is notched like a pie with a slice cut away. A hole in the center holds a composting basket that moistens and nourishes the soil. The garden, which from above looks like a keyhole, can be built with recycled materials and requires less water than a conventional garden.
