Where are you, fellow enthusiasts?

So, we need to revive this topic. Guys, yesterday I watched an episode of Stargate that described a civilization of creatures invisible to the human eye. As I understood the explanation, this is because the light reflected from them is out of phase with the light that the human eye perceives, and that's why we don't see them. So, how possible is this, and what did I misunderstand from that explanation?