One of the inherent problems of selling the 3DS is that you can't film what it does. What it does is a) create 3D images that by definition can't be seen outside that top screen, b) play AR games that are mild controllable meth-addled hallucinations only you can see, and c) Nintendogs. So they show a 3D image, and pan over and you're looking at it on a commercials, and that's not really what it's like, but it probably beats showing some guy waving his 3DS around the room yelling "I'm trying to kiss myself! I have to shoot me! Aah, balloons of my uncle Chuck are attacking wearing samurai helmets!" Now that I've written that, Nintendo should ABSOLUTELY make that its new ad campaign. The 3DS: An Acid Trip for the Whole Family.
(Same thing for any TV ad. You have a superbright screen with 1080i? Well I'm watching your commercial on a 13-inch CRT from 1996. All I can tell is that your monitor shows pictures of the beach, and possibly will make my carpet sandy.)
Here's a third example of something you can understand easily enough by watching, but not by explaining. It's a Super Mario level where, to paraphrase Jon Lovitz in League of Their Own, the station moves, not the train. Mario stays in his box, but the background scrolls, and hiccups when he jumps. The execution won't win any engineering points for smoothness, but the idea behind it (showing a familiar world in a new way) is inspired.