Pinterest has changed me.skruben.blogspot.com, and once I read her explanation, I had to try it out myself. As you can tell, it works!
It was such a good idea They used soda bottles, but we have more juice around than soda. So you cut it off about 1/3 from the top, poke a hole in the lid, and run a string or yarn through the hole, and then fill the top 1/3 with soil and plant your seeds. Thoroughly wet everything, and then fill the bottom with water. The string acts as a wick to pull moisture into the soil when needed, keeping everything at its preferred level of moisture. And I just have to notice when it has run out of water.
The empty looking container in the middle is oregano. Look, they're beginning to sprout!