The different colors in the rough-drawn schematic indicate heights. The darkest green is about one foot tall, the medium green 18 inches tall, and the light green square in the middle stands a proud two feet tall. This adds to the design interest, to be sure; but it also gives four distinct beds to grow in, all which are easily accessible.
If you're at all interested in building your own bed, we can't recommend schematics enough. Draw it down to the inch—this will help you as you start cutting wood, digging up dirt, and even planting your seedlings.
Stay tuned, because Part 3 involves lots of cedar planks, an unbelievable mound of compost, and a drainage pipe that's wearing a tube sock.
For more, check out From Seed to Garden: Claire & Aman's Raised Bed, Part 1.
(Images: Claire Tyler, used with permission)