So easy a 10 year old built it! My son's chore is to wash dishes. He loves listening to music on my wife's iphone when he does and came up with this nifty way to hear the music better! He just took a couple of our cheap salad/cereal bowls and put one on it's side inside the other. Then he put the iphone in the bowls upside down (speaker up) so the sound focused in the bowl. Pretty nifty for a 10 year old!